Define the word parts of speech

In grammar, a part of speech or part-of-speech (abbreviated as POS or PoS, also known as word class^[1] or grammatical category^[2]) is a category of words (or, more generally, of lexical items) that have similar grammatical properties. Words that are assigned to the same part of speech generally display similar syntactic behavior (they play similar roles within the grammatical structure of sentences), sometimes similar morphological behavior in that they undergo inflection for similar properties and even similar semantic behavior. Commonly listed English parts of speech are noun, verb, adjective, adverb, pronoun, preposition, conjunction, interjection, numeral, article, and determiner.

Other terms than part of speech—particularly in modern linguistic classifications, which often make more precise distinctions than the traditional scheme does—include word class, lexical class, and lexical category. Some authors restrict the term lexical category to refer only to a particular type of syntactic category; for them the term excludes those parts of speech that are considered to be function words, such as pronouns. The term form class is also used, although this has various conflicting definitions.^[3] Word classes may be classified as open or closed: open classes (typically including nouns, verbs and adjectives) acquire new members constantly, while closed classes (such as pronouns and conjunctions) acquire new members infrequently, if at all.

Almost all languages have the word classes noun and verb, but beyond these two there are significant variations among different languages.^[4] For example:

• Japanese has as many as three classes of adjectives, where English has one.
• Chinese, Korean, Japanese and Vietnamese have a class of nominal classifiers.
• Many languages do not distinguish between adjectives and adverbs, or between adjectives and verbs (see stative verb).

Because of such variation in the number of categories and their identifying properties, analysis of parts of speech must be done for each individual language. Nevertheless, the labels for each category are assigned on the basis of universal criteria.^[4]

History[edit]

The classification of words into lexical categories is found from the earliest moments in the history of linguistics.^[5]

India[edit]

In the Nirukta, written in the 6th or 5th century BCE, the Sanskrit grammarian Yāska defined four main categories of words:^[6]

1. नाम nāma – noun (including adjective)
2. आख्यात ākhyāta – verb
3. उपसर्ग upasarga – pre-verb or prefix
4. निपात nipāta – particle, invariant word (perhaps preposition)

These four were grouped into two larger classes: inflectable (nouns and verbs) and uninflectable (pre-verbs and particles).

The ancient work on the grammar of the Tamil language, Tolkāppiyam, argued to have been written around 2nd century CE,^[7] classifies Tamil words as peyar (பெயர்; noun), vinai (வினை; verb), idai (part of speech which modifies the relationships between verbs and nouns), and uri (word that further qualifies a noun or verb).^[8]

Western tradition[edit]

A century or two after the work of Yāska, the Greek scholar Plato wrote in his Cratylus dialogue, «sentences are, I conceive, a combination of verbs [rhêma] and nouns [ónoma]».^[9] Aristotle added another class, «conjunction» [sýndesmos], which included not only the words known today as conjunctions, but also other parts (the interpretations differ; in one interpretation it is pronouns, prepositions, and the article).^[10]

By the end of the 2nd century BCE, grammarians had expanded this classification scheme into eight categories, seen in the Art of Grammar, attributed to Dionysius Thrax:^[11]

1. ‘Name’ (ónoma) translated as «Noun«: a part of speech inflected for case, signifying a concrete or abstract entity. It includes various species like nouns, adjectives, proper nouns, appellatives, collectives, ordinals, numerals and more.^[12]
2. Verb (rhêma): a part of speech without case inflection, but inflected for tense, person and number, signifying an activity or process performed or undergone
3. Participle (metokhḗ): a part of speech sharing features of the verb and the noun
4. Article (árthron): a declinable part of speech, taken to include the definite article, but also the basic relative pronoun
5. Pronoun (antōnymíā): a part of speech substitutable for a noun and marked for a person
6. Preposition (próthesis): a part of speech placed before other words in composition and in syntax
7. Adverb (epírrhēma): a part of speech without inflection, in modification of or in addition to a verb, adjective, clause, sentence, or other adverb
8. Conjunction (sýndesmos): a part of speech binding together the discourse and filling gaps in its interpretation

It can be seen that these parts of speech are defined by morphological, syntactic and semantic criteria.

The Latin grammarian Priscian (fl. 500 CE) modified the above eightfold system, excluding «article» (since the Latin language, unlike Greek, does not have articles) but adding «interjection».^[13][14]

The Latin names for the parts of speech, from which the corresponding modern English terms derive, were nomen, verbum, participium, pronomen, praepositio, adverbium, conjunctio and interjectio. The category nomen included substantives (nomen substantivum, corresponding to what are today called nouns in English), adjectives (nomen adjectivum) and numerals (nomen numerale). This is reflected in the older English terminology noun substantive, noun adjective and noun numeral. Later^[15] the adjective became a separate class, as often did the numerals, and the English word noun came to be applied to substantives only.

Classification[edit]

Works of English grammar generally follow the pattern of the European tradition as described above, except that participles are now usually regarded as forms of verbs rather than as a separate part of speech, and numerals are often conflated with other parts of speech: nouns (cardinal numerals, e.g., «one», and collective numerals, e.g., «dozen»), adjectives (ordinal numerals, e.g., «first», and multiplier numerals, e.g., «single») and adverbs (multiplicative numerals, e.g., «once», and distributive numerals, e.g., «singly»). Eight or nine parts of speech are commonly listed:

1. noun
2. verb
3. adjective
4. adverb
5. pronoun
6. preposition
7. conjunction
8. interjection
9. article* or (more recently) determiner

Additionally, there are other parts of speech including particles (yes, no)^[a] and postpositions (ago, notwithstanding) although many fewer words are in these categories.

Some traditional classifications consider articles to be adjectives, yielding eight parts of speech rather than nine. And some modern classifications define further classes in addition to these. For discussion see the sections below.

The classification below, or slight expansions of it, is still followed in most dictionaries:

Noun (names)

a word or lexical item denoting any abstract (abstract noun: e.g. home) or concrete entity (concrete noun: e.g. house); a person (police officer, Michael), place (coastline, London), thing (necktie, television), idea (happiness), or quality (bravery). Nouns can also be classified as count nouns or non-count nouns; some can belong to either category. The most common part of speech; they are called naming words.

Pronoun (replaces or places again)

a substitute for a noun or noun phrase (them, he). Pronouns make sentences shorter and clearer since they replace nouns.

Adjective (describes, limits)

a modifier of a noun or pronoun (big, brave). Adjectives make the meaning of another word (noun) more precise.

Verb (states action or being)

a word denoting an action (walk), occurrence (happen), or state of being (be). Without a verb, a group of words cannot be a clause or sentence.

Adverb (describes, limits)

a modifier of an adjective, verb, or another adverb (very, quite). Adverbs make language more precise.

Preposition (relates)

a word that relates words to each other in a phrase or sentence and aids in syntactic context (in, of). Prepositions show the relationship between a noun or a pronoun with another word in the sentence.

Conjunction (connects)

a syntactic connector; links words, phrases, or clauses (and, but). Conjunctions connect words or group of words

Interjection (expresses feelings and emotions)

an emotional greeting or exclamation (Huzzah, Alas). Interjections express strong feelings and emotions.

Article (describes, limits)

a grammatical marker of definiteness (the) or indefiniteness (a, an). The article is not always listed among the parts of speech. It is considered by some grammarians to be a type of adjective^[16] or sometimes the term ‘determiner’ (a broader class) is used.

English words are not generally marked as belonging to one part of speech or another; this contrasts with many other European languages, which use inflection more extensively, meaning that a given word form can often be identified as belonging to a particular part of speech and having certain additional grammatical properties. In English, most words are uninflected, while the inflected endings that exist are mostly ambiguous: -ed may mark a verbal past tense, a participle or a fully adjectival form; -s may mark a plural noun, a possessive noun, or a present-tense verb form; -ing may mark a participle, gerund, or pure adjective or noun. Although -ly is a frequent adverb marker, some adverbs (e.g. tomorrow, fast, very) do not have that ending, while many adjectives do have it (e.g. friendly, ugly, lovely), as do occasional words in other parts of speech (e.g. jelly, fly, rely).

Many English words can belong to more than one part of speech. Words like neigh, break, outlaw, laser, microwave, and telephone might all be either verbs or nouns. In certain circumstances, even words with primarily grammatical functions can be used as verbs or nouns, as in, «We must look to the hows and not just the whys.» The process whereby a word comes to be used as a different part of speech is called conversion or zero derivation.

Functional classification[edit]

Linguists recognize that the above list of eight or nine word classes is drastically simplified.^[17] For example, «adverb» is to some extent a catch-all class that includes words with many different functions. Some have even argued that the most basic of category distinctions, that of nouns and verbs, is unfounded,^[18] or not applicable to certain languages.^[19][20] Modern linguists have proposed many different schemes whereby the words of English or other languages are placed into more specific categories and subcategories based on a more precise understanding of their grammatical functions.

Common lexical category set defined by function may include the following (not all of them will necessarily be applicable in a given language):

• Categories that will usually be open classes:
  • adjectives
  • adverbs
  • nouns
  • verbs (except auxiliary verbs)
  • interjections
• Categories that will usually be closed classes:
  • auxiliary verbs
  • clitics
  • coverbs
  • conjunctions
  • determiners (articles, quantifiers, demonstrative adjectives, and possessive adjectives)
  • particles
  • measure words or classifiers
  • adpositions (prepositions, postpositions, and circumpositions)
  • preverbs
  • pronouns
  • contractions
  • cardinal numbers

Within a given category, subgroups of words may be identified based on more precise grammatical properties. For example, verbs may be specified according to the number and type of objects or other complements which they take. This is called subcategorization.

Many modern descriptions of grammar include not only lexical categories or word classes, but also phrasal categories, used to classify phrases, in the sense of groups of words that form units having specific grammatical functions. Phrasal categories may include noun phrases (NP), verb phrases (VP) and so on. Lexical and phrasal categories together are called syntactic categories.

Open and closed classes[edit]

Word classes may be either open or closed. An open class is one that commonly accepts the addition of new words, while a closed class is one to which new items are very rarely added. Open classes normally contain large numbers of words, while closed classes are much smaller. Typical open classes found in English and many other languages are nouns, verbs (excluding auxiliary verbs, if these are regarded as a separate class), adjectives, adverbs and interjections. Ideophones are often an open class, though less familiar to English speakers,^[21][22][b] and are often open to nonce words. Typical closed classes are prepositions (or postpositions), determiners, conjunctions, and pronouns.^[24]

The open–closed distinction is related to the distinction between lexical and functional categories, and to that between content words and function words, and some authors consider these identical, but the connection is not strict. Open classes are generally lexical categories in the stricter sense, containing words with greater semantic content,^[25] while closed classes are normally functional categories, consisting of words that perform essentially grammatical functions. This is not universal: in many languages verbs and adjectives^[26][27][28] are closed classes, usually consisting of few members, and in Japanese the formation of new pronouns from existing nouns is relatively common, though to what extent these form a distinct word class is debated.

Words are added to open classes through such processes as compounding, derivation, coining, and borrowing. When a new word is added through some such process, it can subsequently be used grammatically in sentences in the same ways as other words in its class.^[29] A closed class may obtain new items through these same processes, but such changes are much rarer and take much more time. A closed class is normally seen as part of the core language and is not expected to change. In English, for example, new nouns, verbs, etc. are being added to the language constantly (including by the common process of verbing and other types of conversion, where an existing word comes to be used in a different part of speech). However, it is very unusual for a new pronoun, for example, to become accepted in the language, even in cases where there may be felt to be a need for one, as in the case of gender-neutral pronouns.

The open or closed status of word classes varies between languages, even assuming that corresponding word classes exist. Most conspicuously, in many languages verbs and adjectives form closed classes of content words. An extreme example is found in Jingulu, which has only three verbs, while even the modern Indo-European Persian has no more than a few hundred simple verbs, a great deal of which are archaic. (Some twenty Persian verbs are used as light verbs to form compounds; this lack of lexical verbs is shared with other Iranian languages.) Japanese is similar, having few lexical verbs.^[30] Basque verbs are also a closed class, with the vast majority of verbal senses instead expressed periphrastically.

In Japanese, verbs and adjectives are closed classes,^[31] though these are quite large, with about 700 adjectives,^[32][33] and verbs have opened slightly in recent years. Japanese adjectives are closely related to verbs (they can predicate a sentence, for instance). New verbal meanings are nearly always expressed periphrastically by appending suru (する, to do) to a noun, as in undō suru (運動する, to (do) exercise), and new adjectival meanings are nearly always expressed by adjectival nouns, using the suffix -na (〜な) when an adjectival noun modifies a noun phrase, as in hen-na ojisan (変なおじさん, strange man). The closedness of verbs has weakened in recent years, and in a few cases new verbs are created by appending -ru (〜る) to a noun or using it to replace the end of a word. This is mostly in casual speech for borrowed words, with the most well-established example being sabo-ru (サボる, cut class; play hooky), from sabotāju (サボタージュ, sabotage).^[34] This recent innovation aside, the huge contribution of Sino-Japanese vocabulary was almost entirely borrowed as nouns (often verbal nouns or adjectival nouns). Other languages where adjectives are closed class include Swahili,^[28] Bemba, and Luganda.

By contrast, Japanese pronouns are an open class and nouns become used as pronouns with some frequency; a recent example is jibun (自分, self), now used by some young men as a first-person pronoun. The status of Japanese pronouns as a distinct class is disputed,^{[by whom?]} however, with some considering it only a use of nouns, not a distinct class. The case is similar in languages of Southeast Asia, including Thai and Lao, in which, like Japanese, pronouns and terms of address vary significantly based on relative social standing and respect.^[35]

Some word classes are universally closed, however, including demonstratives and interrogative words.^[35]

See also[edit]

• Part-of-speech tagging
• Sliding window based part-of-speech tagging

Notes[edit]

References[edit]

External links[edit]

• Media related to Parts of speech at Wikimedia Commons
• The parts of speech
• Guide to Grammar and Writing
• Martin Haspelmath. 2001. «Word Classes and Parts of Speech.» In: Baltes, Paul B. & Smelser, Neil J. (eds.) International Encyclopedia of the Social and Behavioral Sciences. Amsterdam: Pergamon, 16538–16545. (PDF)

Every word is a part of speech, each playing a specific role in a sentence. There are 8 different parts of speech including noun, verb, adjective, adverb, pronoun, preposition, conjunction, and interjection. Each word in a sentence plays a vital role in conveying the meaning and intent of the sentence.

What is Part of Speech?

The English language has thousands of words and every word has some function to perform. Some words are there to show action, some to join, and some to name something. And together, all the functions performed by words in the English language fall under Parts of speech.           
 

Parts of Speech Definition

The parts of speech are the “traditional grammatical categories to which words are assigned in accordance with their syntactic functions, such as noun, verb, adjective, adverb, and so on.” In other words, they refer to the different roles that words can play in a sentence and how they relate to one another based on grammar and syntax.

Parts of Speech Table

Types	Function	Examples	Sentences
Noun	Refers Things or person	Pen, Chair, Ram, Honesty	Cars are expensive. This chair is of wood. Ram is a topper. Honesty is the best policy.
Pronoun	Replaces a noun	I, you, he, she, it, they	They are expensive. It is of wood. He is a topper. It is the best policy
Adjective	Describes a noun	Super, Red, Our, Big, Great class	Super cars are expensive Red chair is for kids Ram is a class topper. Great things take time.
Verb	Describes action or state	Play, be, work, love, like	I play football I will be a doctor I like to work I love writing poem.
Adverb	Describes a verb, adjective or adverb	Silently, too, very	I love reading silently. It is too tough to handle. He can speak very fast.
Preposition	Links a noun to another word	at, in, of, after, under,	The ball is under the table. I am at a restaurant. she is in trouble. I am going after her. It is so nice of him
Conjunction	Joins clauses and sentences	and, but, though, after	First, I will go to college and then I may go to fest. I don’t have a car but I know how to drive. She failed the exam though she worked hard. He will come after he finish his match.
Interjection	Shows exclamation	oh!, wow!, alas! Hurray!	Oh! I got fail again. Wow! I got the job. Alas! She is no more. Hurray! we are going to party.

Parts of Speech Examples with Sentences

Noun

Examples: Luggage, Cattle.

Sentence:  Never leave your luggage unattended.

In some places, cattle are fed barely.

Pronoun

Examples: who, either, themselves

Sentence: I know a man who plays the guitar very well.

Either of the two cars is for sale.

They enjoyed themselves at the party.

Adjective

Examples: kind, moving, wounder.

Sentence: 

She is a kind person.

Boarding a moving bus can be dangerous.

Never poke a wounded animal.

Verb

Examples: Praise, Hate, Punish

Sentence: She always praises her friends.

I don’t hate anybody.

The boy has been punished by his teacher

Adverb

Examples: Always, enough, immediately

Sentence: we should always help each other.

We should be wise enough to understand what is good for us.

We should leave bad habits immediately.

Preposition

Examples: Off, Below, From. to

Sentence: 

He plunged off the cliff

I live below the 9th floor.

I travel daily from Delhi to Noida.

Conjunction

Examples: whereas, as well as, so, 

Sentence: The new software is fairly simple whereas the old one was a bit complicated.

The finance company is not performing well as well as some of its competitors.

He was ready so he may come. 

Interjection

Examples: oops! whoa! phew! 

Sentence: Oops! I forgot to mention her name.

Whoa! you drive fast. 

Phew! That was close call, we had a narrow escape.

Parts of Speech Quiz

Choose the correct Parts of Speech of the BOLD word from the following questions.

1. Let us play, Shall We?

       a. Conjunction

       b. Pronoun

       c. Verb

2.  It is a good practice to arrange books on shelves.

      a. Verb

      b. Noun

      c. Adjective

3. Whose books are these?

      a. Pronoun

     b. Preposition

     c. verb

4.  Father, please get me that toy. 

     a. Pronoun

     b. Adverb

     c. Adjective

5.  His mentality is rather obnoxious.

     a. Adverb

     b. Adjective

     c. Noun

6.  He is the guy whose money got stolen.

      a. Pronoun

      b. Conjunction

      c. Adjective

7. I will have finished my semester by the end of this year.

      a. Interjection

      b. Conjunction

      c. Preposition

8. Bingo! That’s the one I have been looking for

    a. Interjection

     b. Conjunction

     c. Preposition

Quiz Answers

1. c,  2. b,  3. a,  4. c,  5. a,  6. b,  7. c,  8. a

FAQs on Parts of Speech

Q1. What are Parts of Speech?

Ans. A word is assigned to a category as per its function, and those categories are together known as Parts of Speech.

Q2. What are the 8 Parts of Speech?

Ans. Noun, Pronoun, Adjective, Verb, Adverb, Preposition, Conjunction, Interjection.

Q3. How many Parts of Speech are there?

Ans. There are a total of 8 parts of Speech.

Q4. What Part of Speech is “our”?

Ans. Adjective. Eg. Our car.

Q5. What Part of Speech is “Quickly”?

Ans. Adverb. let us understand it with this example – Milk sours quickly in warm weather.

A part of speech is a term used in traditional grammar for one of the nine main categories into which words are classified according to their functions in sentences, such as nouns or verbs. Also known as word classes, these are the building blocks of grammar.

Every sentence you write or speak in English includes words that fall into some of the nine parts of speech. These include nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, articles/determiners, and interjections. (Some sources include only eight parts of speech and leave interjections in their own category.)

Learning the names of the parts of speech probably won’t make you witty, healthy, wealthy, or wise. In fact, learning just the names of the parts of speech won’t even make you a better writer. However, you will gain a basic understanding of sentence structure and the English language by familiarizing yourself with these labels.

Open and Closed Word Classes

The parts of speech are commonly divided into open classes (nouns, verbs, adjectives, and adverbs) and closed classes (pronouns, prepositions, conjunctions, articles/determiners, and interjections). The idea is that open classes can be altered and added to as language develops and closed classes are pretty much set in stone. For example, new nouns are created every day, but conjunctions never change.

In contemporary linguistics, the label part of speech has generally been discarded in favor of the term word class or syntactic category. These terms make words easier to qualify objectively based on word construction rather than context. Within word classes, there is the lexical or open class and the function or closed class.

Read about each part of speech below and get started practicing identifying each.

Noun

Nouns are a person, place, thing, or idea. They can take on a myriad of roles in a sentence, from the subject of it all to the object of an action. They are capitalized when they’re the official name of something or someone, called proper nouns in these cases. Examples: pirate, Caribbean, ship, freedom, Captain Jack Sparrow.

Pronoun

Pronouns stand in for nouns in a sentence. They are more generic versions of nouns that refer only to people. Examples:​ I, you, he, she, it, ours, them, who, which, anybody, ourselves.

Verb

Verbs are action words that tell what happens in a sentence. They can also show a sentence subject’s state of being (is, was). Verbs change form based on tense (present, past) and count distinction (singular or plural). Examples: sing, dance, believes, seemed, finish, eat, drink, be, became

Adjective

Adjectives describe nouns and pronouns. They specify which one, how much, what kind, and more. Adjectives allow readers and listeners to use their senses to imagine something more clearly. Examples: hot, lazy, funny, unique, bright, beautiful, poor, smooth.

Adverb

Adverbs describe verbs, adjectives, and even other adverbs. They specify when, where, how, and why something happened and to what extent or how often. Examples: softly, lazily, often, only, hopefully, softly, sometimes.

Preposition

Prepositions show spacial, temporal, and role relations between a noun or pronoun and the other words in a sentence. They come at the start of a prepositional phrase, which contains a preposition and its object. Examples: up, over, against, by, for, into, close to, out of, apart from.

Conjunction

Conjunctions join words, phrases, and clauses in a sentence. There are coordinating, subordinating, and correlative conjunctions. Examples: and, but, or, so, yet, with.

Articles and Determiners

Articles and determiners function like adjectives by modifying nouns, but they are different than adjectives in that they are necessary for a sentence to have proper syntax. Articles and determiners specify and identify nouns, and there are indefinite and definite articles. Examples: articles: a, an, the; determiners: these, that, those, enough, much, few, which, what.

Some traditional grammars have treated articles as a distinct part of speech. Modern grammars, however, more often include articles in the category of determiners, which identify or quantify a noun. Even though they modify nouns like adjectives, articles are different in that they are essential to the proper syntax of a sentence, just as determiners are necessary to convey the meaning of a sentence, while adjectives are optional.

Interjection

Interjections are expressions that can stand on their own or be contained within sentences. These words and phrases often carry strong emotions and convey reactions. Examples: ah, whoops, ouch, yabba dabba do!

How to Determine the Part of Speech

Only interjections (Hooray!) have a habit of standing alone; every other part of speech must be contained within a sentence and some are even required in sentences (nouns and verbs). Other parts of speech come in many varieties and may appear just about anywhere in a sentence.

To know for sure what part of speech a word falls into, look not only at the word itself but also at its meaning, position, and use in a sentence.

For example, in the first sentence below, work functions as a noun; in the second sentence, a verb; and in the third sentence, an adjective:

• Bosco showed up for work two hours late.
  • The noun work is the thing Bosco shows up for.
• He will have to work until midnight.
  • The verb work is the action he must perform.
• His work permit expires next month.
  • The attributive noun [or converted adjective] work modifies the noun permit.

Learning the names and uses of the basic parts of speech is just one way to understand how sentences are constructed.

Dissecting Basic Sentences

To form a basic complete sentence, you only need two elements: a noun (or pronoun standing in for a noun) and a verb. The noun acts as a subject and the verb, by telling what action the subject is taking, acts as the predicate. 

• Birds fly.

In the short sentence above, birds is the noun and fly is the verb. The sentence makes sense and gets the point across.

You can have a sentence with just one word without breaking any sentence formation rules. The short sentence below is complete because it’s a command to an understood «you».

• Go!

Here, the pronoun, standing in for a noun, is implied and acts as the subject. The sentence is really saying, «(You) go!»

Constructing More Complex Sentences

Use more parts of speech to add additional information about what’s happening in a sentence to make it more complex. Take the first sentence from above, for example, and incorporate more information about how and why birds fly.

• Birds fly when migrating before winter.

Birds and fly remain the noun and the verb, but now there is more description. 

When is an adverb that modifies the verb fly. The word before is a little tricky because it can be either a conjunction, preposition, or adverb depending on the context. In this case, it’s a preposition because it’s followed by a noun. This preposition begins an adverbial phrase of time (before winter) that answers the question of when the birds migrate. Before is not a conjunction because it does not connect two clauses.

—
The term “parts of speech” is accepted by modern linguistics as a
conventional, or “non-explanatory” term (“name-term”) to
denote the lexico-grammatical classes
of words correlating with each other in the general system of
language on the basis of their grammatically relevant properties.

There
are three types of grammatically relevant properties of words that
differentiate parts of speech: semantic,
formal and functional properties.
They traditionally make the criteria for the classification of parts
of speech.

—
The semantic
criterion
refers to the generalized semantic properties common to the whole
class of words, e.g.: the generalized (or, categorial) meaning of
nouns is “thingness”, of verbs “process”, of adjectives
“substantive property”, of adverbs “non-substantive property”.

—
The formal
criterion
embraces the formal features (word-building and word-changing) that
are characteristic for a particular part of speech, e.g.: the noun is
characterized by a specific set of word-building affixes, cf.:
property,
bitterness, worker,
etc., and is changed according to the categories of number, case and
article determination: boy-boys,
boy – boy’s, boy – the boy – a boy, etc.
Combinability
is also a relevant formal feature for each particular part of speech;
for example, verbs can be modified by adverbs, while nouns cannot
(except in specific contexts).

—
The functional
criterion
is based on the functions that the words of a particular class
fulfill in the sentence, e.g.: the most characteristic functions of
the noun are those of a subject and an object; the only function of
the finite form of the verb is that of a predicate; the adjective
functions in most contexts as an attribute; the adverb as an
adverbial modifier.

—
Traditionally, all parts of speech are subdivided on the upper level
of classification into notional words and functional words. Notional
words, which traditionally include nouns, verbs, adjectives, adverbs,
pronouns and numerals, have complete nominative meanings, are in most
cases changeable and fulfill self-dependent syntactic functions in
the sentence. The noun, for example, as a part of speech, is
traditionally characterized by 1) the categorial meaning of substance
(“thingness”), 2) a specific set of word-building affixes, the
grammatical categories of number, case and article determination,
prepositional connections and modification by an adjective, and 3)
the substantive functions of subject, object or predicative in the
sentence. In the same way, all the other notional parts of speech are
described. Functional
words, which include conjunctions, prepositions, articles,
interjections, particles, and modal words, have incomplete nominative
value, are unchangeable and fulfill mediatory, constructional
syntactic functions.

The employment of the three
criteria combined, in present-day mainstream linguistics, was
developed mainly by V. V. Vinogradov, L. V. Scherba, A. I.
Smirnitsky, B. A. Ilyish and others.

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