Is really a compound word

Scientists are big into molecular compounds, and there is something kind of magical about them. You can start with a couple of atoms of hydrogen, add another atom of oxygen, and bada bing: water. Two distinct elements come together to create something entirely different.

It’s exactly the same with words. Well, maybe not exactly the same, but English is such a flexible, creative language that it’s filled with compound words—and new ones are popping up all the time to suit our ever-changing world. Some useful compound words recently added to Merriam-Webster are clickbait, photobomb, binge-watch, humblebrag, and spit-take.

So what is a compound word? How do you know whether it should be a closed compound, a hyphenated compound, or an open compound? What about compound sentences? We’ll look at all of these in this post.
 

When two (or occasionally, three) words work together to express a single idea, that’s a compound word. Compound words can be open, closed, or hyphenated, and they can function as nouns, adjectives, or adverbs. English is full of preexisting compound words—or you can make up your own to suit the situation.

No one at the Star Trek convention really appreciated my Klingon-librarian costume.

The lung-collapsing dead-flower stench of my aunt Penelope’s perfume was headache-inducingly strong.

What is an open compound word?

An open compound word is two separate words (without even a hyphen to link them) functioning as a single idea.

When we were in high school, we regularly ate French fries, hot dogs, and ice cream with peanut butter as an afterschool snack.

What is a hyphenated compound word?

A hyphenated compound word is a term composed of two (or more) words connected by a hyphen. Like other compound words, a hyphenated compound can be a noun, adjective, or adverb.

The gun-toting, card-carrying FBI agent hid her angst well.

What is a closed compound word?

A closed compound word is a single word constructed of two or more other words. Most closed compound words were once open or hyphenated, but continued use solidified them—made them a single unit. Today’s open or hyphenated compounds are tomorrow’s closed compounds.

The moonlight coming through my bedroom window is so bright it outshines my flashlight.

Every afternoon, she wrote another story in her notebook; my favorite is the one about the starfish who loved rainbows and strawberries.

How do you know whether a compound word is open, hyphenated, or closed?

There’s really no trick to this! You look it up in a dictionary (like Merriam-Webster). Compound words evolve over time, so what was once black-bird is now blackbird, and what was once a web site is now almost always a website.

Don’t worry if you find dictionaries contradicting each other! Not every dictionary agrees on which compounds are open, hyphenated, or closed. Some offer health care and voice mail, for example, as two words, but others hyphenate or close those same compounds. In such cases, you’re free to use the spelling you prefer, except if you’re supposed to be following a particular style guide.

For example, the Chicago Manual of Style (CMoS) says that when a compound modifier comes before a noun, it’s never wrong to hyphenate it, since it can aid readability.

The seventy-year-old professor despaired for the dull-witted students in her late-afternoon class.

But (Chicago goes on to say) when compound modifiers follow the noun, leave them unhyphenated (even if they’re hyphenated in the dictionary).

The professor, who was almost seventy years old, couldn’t understand why her students were so dull witted by late afternoon.

What is a compound noun?

Compound words can be nouns, adjectives, adverbs—and even verbs (like pole-vault or double-click). In each case, they can be open, hyphenated, or closed. Compound nouns are perhaps the most common type of compound word. Here are some examples of compound nouns (some closed, some open, some hyphenated).

Susan’s grandmother, my mother-in-law, had a skylight above the bookcase in her living room that let in rainwater.

Watch out for the sometimes-unusual plurals of hyphenated compound nouns.

The workmen fixing the two merry-go-rounds in the local park typically catcalled all passersby, but they stopped once our attorneys-at-law sent them a warning.

What is a compound name?

A compound name is essentially a compound proper noun—a multiword term (often an open compound, though not always) that names a single entity.

Like Popeye, Black Panther gets at least some of his powers from eating his greens—in his case, the heart-shaped herb. But I bet Superman liked Cheez-Its better.

What’s important here is that these proper nouns are always preexisting compounds, so if you’re turning an open compound name into part of a compound modifier (see more about compound adjectives and adverbs below), you’ll need to use an en dash rather than a hyphen.

My new World War I–era cloche didn’t really go with anything in my New York–style wardrobe, so naturally I had to go shopping.

 

 

What is a compound adjective?

A compound adjective is a single adjective made up of more than one word—and it’s often a compound noun (or even compound name) being used to modify another noun. According to CMoS, it’s never wrong to hyphenate multiword adjectives when they precede a noun, even if they’re familiar open compounds like high school.

High-school students often have more brain-draining homework than college students.

My silly-voiced sister found her calling in advertising.

When a compound name functions as an adjective, there’s no need for a hyphen.

Penny was thrilled to win Dolly Parton tickets.

The Los Angeles weather is typically hot and sunny.

As touched on above, when a compound adjective follows a noun, the hyphen is usually not necessary.

Georgia is a well-read academic.

Georgia is well read.

I found a useful list of low-calorie cocktails.

I found a useful list of cocktails, all of them low calorie.

Remember that compound adjectives made from an adverb ending in –ly plus an adjective are never hyphenated. The -ly is enough of a signal that what follows is meant to be read together with the preceding word.

Sarah’s short-tempered grandfather griped about her recital, calling it a really dull concert.

Sarah’s grandfather, always short tempered, griped about her recital, describing it as really dull.

What is a compound adverb?

A compound adverb looks like a single word but (closely examined) is actually made up of two or more words working together to function as a single adverb. They’re often rather old fashioned, and they can sound stuffy and pompous so are best used sparingly: notwithstanding, nevertheless, heretofore, albeit, and so on.

Phrasal adverbs are very similar to compound adverbs, and they’re rather more useful.

I scattered rose petals here and there.

The newly married couple walked arm in arm.

Joseph goes running every day.

What is a compound sentence?

And here’s the bonus section (because the last thing we want to do is compound anyone’s confusion about compounds)!

Compound sentences are grammatically unrelated to compound words, but that still doesn’t answer the key question: What is a compound sentence? A compound sentence is when two or more independent clauses, each with its own subject and verb plus attendant objects and phrases, are joined with a coordinating conjunction (one of the FANBOYS: for, and, nor but, or, yet, so). Here, the key thing to remember is to always include a comma after the first independent clause and before the conjunction.

I read this blog post about compound words, but they didn’t explain about compound sentences, so I had to keep on searching.

My son’s story about the strawberry-loving starfish was really cute, so I sent it to my sister, and she loved it too.

Every word has its own meaning. You can search for the definition of every term in the dictionary. But do you know that you can put two words together and have a brand new meaning? Of course, not all words can be put together for such a case. However, many ones are already accepted in the English language. These words are called compound words.

What Are Compound Words?

Compound words are formed when two or more words are combined to produce a new one. This newly-constructed word has its own meaning that can either be related to the base words or not.

Types of Compound Words

Open Compound Words

Open compound words remain separate when written but are used together to create a new idea. For example, “peanut” and “butter” are unrelated to each other. But when you combine them and use them as one word, you will have “peanut butter,” which is already a different noun with its own meaning.

Closed Compound Words

Closed compound words are formed by combining two fully independent words together without space in between. An example of a closed-form compound word is “grandfather,” in which “grand” and “father” are put together.

Hyphenated Compound Words

Another possible form of a compound word is the hyphenated one. From the word itself, the independent terms used are separated by a hyphen or dash. A common example is “mother-in-law.”

Compound Nouns

Compound nouns are simply compound words that act as nouns. Nouns are names of people, animals, places, things, or events. However, it does not mean that the two words comprising it should only be nouns. A compound noun can be formed by combining two nouns, an adjective and a noun, a verb and a noun, and many more.

Compound Verbs

A compound verb is also called a complex predicate. It is a multi-word compound that acts as a single verb. It can be constructed by putting together a verb and a preposition or a verb and an adverb (phrasal verbs). Auxiliary verbs that are followed by the main verb can also be considered compounds. Some other combinations that involve a verb and a non-verb word can also be considered compound verbs if they indicate action.

Compound Adjectives

Two or more words that function as one and describe a noun are called compound adjectives. Usually, they are separated by a hyphen.

List of Compound Words

Open Compound Words

• Ice cream
• Ice cream cake
• Ice cube
• Cream cheese
• Hot dog
• Corn dog
• Corned beef
• Apple pie
• Sugar plum
• Web page
• Table cloth
• Fire drill
• Fire drill
• Fire exit
• High school
• Roller coaster
• Living room
• First aid
• Full moon
• Tea cup
• Serving spoon
• Real estate
• Car pool
• Cotton bud
• Cotton ball
• Video game
• Coffee grain
• Coffee mug
• Post office
• Upper deck
• Hand towel
• Sweet tooth
• Common sense
• Dance hall
• Police officer
• Vice president
• Science fiction
• Root word
• Candy cane
• Christmas tree
• Cell membrane
• Jumping jack
• Report card
• Credit card
• Debit card
• Radio wave
• Snack house
• Coffee shop
• Bus stop
• Swimming pool
• Rubber band
• Ice hockey
• Ice skate
• Break up
• Take away
• Take out
• Break away
• Lift up
• Push down
• Pull down
• Ask out
• Ask around
• Make up
• Turn in
• Fill up
• Fill out
• Fill in

Closed Compound Words

• Basketball
• Football
• Baseball
• Worldwide
• Overpass
• Southeast
• Northeast
• Northwest
• Southwest
• Bushfire
• Mailbox
• Snowball
• Skateboard
• Sailboat
• Birthday
• Blackboard
• Everything
• Anything
• Anyone
• Everyone
• Classmate
• Schoolmate
• Playmate
• Grandmother
• Grandfather
• Granddaughter
• Grandson
• Grasshopper
• Sunflower
• Sunrise
• Sunshine
• Moonlight
• Freelance
• Eyeball
• Eyebrow
• Eyelash
• Armpit
• Playground
• Teamwork
• Stoplight
• Flashlight
• Lighthouse
• Fireman
• Rainbow
• Raindrop
• Bedroom
• Popcorn
• Keyboard
• Notepad
• Keyhole
• Keystone
• Pothole
• Bowtie
• Necktie
• Brainwash
• Proofread
• Babysit
• Horseshoe
• Highlight
• Notebook
• Bookstore
• Lipstick
• Makeup
• Toothpaste
• Toothbrush
• Airbrush
• Crosswalk
• Crossroad
• Crossover
• Nightfall
• Riverbank
• Nutcracker
• Candlelight
• Backstroke
• Hamburger
• Cheeseburger
• Sandwich
• Homesick
• Uptown
• Rattlesnake
• Workplace
• Wrongdoing
• Springtime
• Underdog
• Strawberry
• Blueberry
• Watermelon
• Pineapple
• Cupcake

Hyphenated Compound Words

• Mother-in-law
• Father-in-law
• Sister-in-law
• Brother-in-law
• Sergeant-at-arms
• Merry-go-round
• Happy-go-lucky
• Editor-in-chief
• Over-the-counter
• Up-to-date
• State-of-the-art
• Long-term
• High-speed
• Left-handed
• Right-handed
• In-depth
• Full-length
• Part-time
• Long-haired
• Sun-dried
• Breath-taking
• Self-centered
• Well-off
• Well-known
• Gift-wrap
• Follow-up
• Well-being
• Single-minded
• Knee-length
• Short-tempered
• Off-site
• Runner-up
• One-sided
• Tip-off
• Blush-on
• Sugar-free
• Ice-cold
• Far-flung
• High-rise
• Life-size
• King-size
• Warm-blooded
• Cold-blooded
• Get-together
• Next-door

A Huge List of Compound Words

Following is a list of 1000 close compound words in English

• Aboveboard
• Afterbirth
• Afterburner
• Afterglow
• Afterimage
• Afterlife
• Aftermath
• Afternoon
• Airbrush
• Aircraft
• Airfield
• Airlift
• Airline
• Airliner
• Airmail
• Airman
• Airmen
• Airplane
• Airport
• Airship
• Airtime
• Allover
• Allspice
• Alongside
• Also
• Another
• Anybody
• Anyhow
• Anymore
• Anyone
• Anyplace
• Anything
• Anytime
• Anyway
• Anywhere
• Armchair
• Armpit
• Around
• Arrowhead
• Ashtray
• Authorship
• Babysit
• Babysitter
• Backache
• Backbite
• Backbone
• Backbreaker
• Backdrop
• Backfield
• Backfire
• Background
• Backhand
• Backlash
• Backlog
• Backpack
• Backside
• Backslap
• Backslide
• Backspace
• Backspin
• Backstage
• Backstop
• Backstretch
• Backstroke
• Backtrack
• Backward
• Ballpark
• Ballroom
• Bankbook
• Bankroll
• Baseball
• Basketball
• Beachcomb
• Became
• Because
• Become
• Bedbug
• Bedclothes
• Bedrock
• Bedroll
• Bedroom
• Bellbottom
• Bellboy
• Bellhop
• Below
• Birthday
• Blackball
• Blackberries
• Blackbird
• Blackboard
• Blackjack
• Blacklist
• Blackmail
• Blackout
• Blacksmith
• Blacktop
• Bluebell
• Blueberry
• Bluebird
• Bluefish
• Bluegrass
• Blueprint
• Boardwalk
• Bodyguard
• Bodywork
• Boldface
• Bookbinder
• Bookcase
• Bookend
• Bookkeeper
• Booklet
• Bookmark
• Bookmobile
• Bookseller
• Bookshelf
• Bookstore
• Bookworm
• Bootstrap
• Bowtie
• Brainchild
• Brainstorm
• Brainwash
• Bugspray
• Bushfire
• Buttercup
• Butterfat
• Butterfingers
• Butterflies
• Buttermilk
• Butternut
• Butterscotch
• Bypass
• Cabdriver
• Cancan
• Candid
• Candlelight
• Candlestick
• Cannot
• Cardboard
• Cardsharp
• Cardstock
• Carefree
• Caretaker
• Careworn
• Carfare
• Cargo
• Carhop
• Carload
• Carpetbagger
• Carpool
• Carport
• Carrack
• Carryall
• Carsick
• Cartwheel
• Carwash
• Cattail
• Catwalk
• Caveman
• Centercut
• Cheeseburger
• Cheesecake
• Classmate
• Clockwise
• Coffeemaker
• Comeback
• Comedown
• Commonplace
• Commonwealth
• Cornball
• Cornmeal
• Cornstalk
• Cornwall
• Cottonmouth
• Cottontail
• Cottonwood
• Countdown
• Counterattack
• Counterbalance
• Counterclockwise
• Counterintelligence
• Countermeasure
• Counteroffensive
• Counterpane
• Counterpart
• Counterpoint
• Counterpoise
• Courthouse
• Courtroom
• Courtyard
• Crewcut
• Crossbow
• Crossbreed
• Crosscut
• Crossover
• Crossroad
• Crosstown
• Crosswalk
• Crossword
• Cupcake
• Dairymaid
• Daisywheel
• Daybed
• Daybook
• Daybreak
• Daydream
• Daylight
• Daytime
• Deadend
• Deadline
• Dishcloth
• Dishpan
• Dishwasher
• Dishwater
• Diskdrive
• Dogwood
• Doorstop
• Downbeat
• Downunder
• Drawbridge
• Driveway
• Duckbill
• Duckpin
• Earache
• Eardrop
• Eardrum
• Earring
• Earthbound
• Earthquake
• Earthward
• Earthworm
• Egghead
• Eggshell
• Elsewhere
• Everyone
• Everything
• Eyeball
• Eyeballs
• Eyebrow
• Eyecatching
• Eye-catching
• Eyeglasses
• Eyelash
• Eyelid
• Eyesight
• Eyewitness
• Fatherland
• Fatherless
• Firearm
• Fireball
• Fireboat
• Firebomb
• Firebox
• Firebreak
• Firecracker
• Firefighter
• Fireflies
• Firehouse
• Fireman
• Fireproof
• Firewater
• Fireworks
• Fishbowl
• Fisherman
• Fisheye
• Fishhook
• Fishlike
• Fishmonger
• Fishnet
• Fishpond
• Fishtail
• Flashlight
• Football
• Foothill
• Foothold
• Footlights
• Footlocker
• Footnote
• Footpath
• Footprints
• Footrest
• Forbearer
• Forbid
• Forearm
• Forebear
• Forecast
• Forecastle
• Foreclose
• Foreclosure
• Foredoom
• Forefather
• Forefinger
• Forefront
• Forehand
• Forehead
• Foreleg
• Foreman
• Foremost
• Forepaws
• Forerunner
• Foresee
• Foresight
• Forestall
• Forestland
• Forever
• Forget
• Forgive
• Forklift
• Format
• Fortnight
• Freelance
• Friendship
• Fruitcup
• Gearshift
• Glassmaking
• Goodbye
• Goodnight
• Grandaunt
• Grandchild
• Grandchildren
• Granddaughter
• Grandfather
• Grandmaster
• Grandmother
• Grandnephew
• Grandnieces
• Grandparent
• Grandson
• Grandstand
• Granduncle
• Grasshopper
• Graveyard
• Gumball
• Haircut
• Hamburger
• Hammerhead
• Hamstring
• Handball
• Handbook
• Handcuff
• Handgun
• Handmade
• Handout
• Headache
• Headdress
• Headhunter
• Headlight
• Headline
• Headquarters
• Hedgehop
• Heirloom
• Hellcat
• Hellhole
• Helpmate
• Helpmeet
• Hemstitch
• Henceforth
• Henchman
• Henpeck
• Hereabout
• Hereafter
• Hereby
• Herein
• Hereof
• Hereupon
• Herself
• Highball
• Highchair
• Highland
• Highlight
• Highway
• Himself
• Homemade
• Homesick
• Hometown
• Honeybee
• Honeycomb
• Honeydew
• Honeymoon
• Honeysuckle
• Hookup
• Hookworm
• Horseback
• Horsefly
• Horsehair
• Horseplay
• Horsepower
• Horseradish
• Horseshoe
• Houseboat
• Housecoat
• Household
• Housekeeper
• Housetop
• Housewife
• Housework
• However
• Ideal
• Inchworm
• Income
• Indoors
• Inflow
• Infold
• Infuse
• Infusion
• Inhale
• Inkblot
• Inkwell
• Inland
• Inmate
• Inpatient
• Inroad
• Inset
• Inside
• Intake
• Ironwork
• Itself
• Jackpot
• Jackson
• Jailbait
• Jailbird
• Jawbone
• Jawbreaker
• Jaywalk
• Jellybean
• Jellyfish
• Jerkwater
• Jerrybuild
• Jetliner
• Jetport
• Jigsaw
• Jimsonweed
• Jitterbug
• Jobholder
• Johnnycake
• Jumpshot
• Keepsake
• Keyboard
• Keyhole
• Keynote
• Keypad
• Keypunch
• Keystone
• Keystroke
• Keyway
• Keyword
• Landmark
• Landslide
• Landward
• Lapland
• Lapwing
• Larkspur
• Laughingstock
• Lawgiver
• Lawmaker
• Lawsuit
• Layman
• Layoff
• Layout
• Layover
• Leapfrog
• Lifeblood
• Lifeboat
• Lifeguard
• Lifelike
• Lifeline
• Lifelong
• Lifesaver
• Lifetime
• Lifework
• Lighthouse
• Limelight
• Limestone
• Lipstick
• Longhand
• Longhorn
• Longhouse
• Lukewarm
• Mailbox
• Mainland
• Mainline
• Mainspring
• Mainstream
• Makeup
• Matchbox
• Meadowland
• Meantime
• Meanwhile
• Moonbeam
• Moonlight
• Moonlit
• Moonscape
• Moonshine
• Moonstone
• Moonstruck
• Moonwalk
• Moreover
• Mothball
• Motherhood
• Motorcycle
• Nearby
• Necktie
• Nevermore
• Newborn
• Newfound
• Newsboy
• Newsbreak
• Newscast
• Newscaster
• Newsdealer
• Newsletter
• Newsman
• Newsmen
• Newspaper
• Newsperson
• Newsprint
• Newsreel
• Newsroom
• Newsstand
• Newsworthy
• Nightfall
• Nobody
• Noisemaker
• Northeast
• Northwest
• Notebook
• Notepad
• Noteworthy
• Nowhere
• Nursemaid
• Nutcracker
• Oneself
• Onetime
• Overabundance
• Overboard
• Overcoat
• Overflow
• Overland
• Overpass
• Overshoes
• Pacemaker
• Pancake
• Parkway
• Passbook
• Passkey
• Passover
• Passport
• Password
• Pasteboard
• Patchwork
• Pathfinder
• Pathway
• Pawnbroker
• Pawnshop
• Paycheck
• Payload
• Paymaster
• Payoff
• Payroll
• Peppermint
• Pickup
• Pineapple
• Pinhole
• Pinpoint
• Pinstripe
• Pinup
• Pinwheel
• Playback
• Playboy
• Playground
• Playhouse
• Playmate
• Playthings
• Ponytail
• Popcorn
• Postcard
• Pothole
• Proofread
• Racquetball
• Railroad
• Railway
• Rainbow
• Raincheck
• Raincoat
• Raindrop
• Rainfall
• Rainmaker
• Rainstorm
• Rainwater
• Ratline
• Ratsbane
• Rattlesnake
• Rattletrap
• Rawboned
• Rawhide
• Readywitted
• Rearmost
• Rearrange
• Rearward
• Redcap
• Redcoat
• Reddish
• Redhead
• Repairman
• Riverbank
• Riverbanks
• Rubberband
• Sailboat
• Salesclerk
• Sandbox
• Sandlot
• Sandstone
• Sandwich
• Saucepan
• Scapegoat
• Scarecrow
• Schoolbook
• Schoolboy
• Schoolbus
• Schoolhouse
• Schoolmate
• Schoolroom
• Schoolwork
• Seashore
• Setback
• Setoff
• Shadyside
• Sharecropper
• Sharpshooter
• Sheepskin
• Shipbottom
• Shipbuilder
• Shipload
• Shipwreck
• Shipyard
• Shoelace
• Shoemaker
• Shopkeeper
• Shortbread
• Shortcake
• Shotgun
• Showboat
• Showoff
• Showplace
• Showroom
• Sideburns
• Sidecar
• Sidekick
• Sideshow
• Sidewalk
• Silversmith
• Sisterhood
• Sixfold
• Skateboard
• Skintight
• Skylark
• Skylight
• Skyscraper
• Slapstick
• Slowdown
• Slumlord
• Snakeskin
• Snowball
• Snowbank
• Snowbird
• Snowdrift
• Snowshoe
• Snowshovel
• Snowstorm
• Soapstone
• Softball
• Software
• Somebody
• Someday
• Somehow
• Someone
• Someplace
• Something
• Sometime
• Sometimes
• Someway
• Somewhat
• Somewhere
• Soundproof
• Southeast
• Southwest
• Soybean
• Spacesuit
• Spacewalk
• Spearmint
• Speedboat
• Spillway
• Spokesperson
• Springtime
• Stagehand
• Standby
• Standoff
• Standout
• Standpipe
• Standpoint
• Standstill
• Starfish
• Steamboat
• Steamship
• Stepson
• Stickup
• Stockroom
• Stonewall
• Stoplight
• Stopwatch
• Storerooms
• Strawberry
• Streetcar
• Stronghold
• Subway
• Sunbaked
• Sunbathe
• Sunday
• Sundial
• Sundown
• Sunfish
• Sunflower
• Sunglasses
• Sunlit
• Sunray
• Sunrise
• Sunroof
• Sunshine
• Suntan
• Sunup
• Supercargo
• Supercharge
• Supercool
• Superego
• Superfine
• Supergiant
• Superhero
• Superhighways
• Superhuman
• Superimpose
• Superman
• Supermarket
• Supermen
• Supernatural
• Superpower
• Superscript
• Supersensitive
• Supersonic
• Superstar
• Superstrong
• Superstructure
• Supertanker
• Superweapon
• Superwoman
• Sweetheart
• Sweetmeat
• Tablecloth
• Tablespoon
• Tabletop
• Tableware
• Tadpole
• Tagalong
• Tailbone
• Tailcoat
• Tailgate
• Taillight
• Taillike
• Tailpiece
• Tailspin
• Takeoff
• Takeout
• Takeover
• Talebearer
• Taleteller
• Tapeworm
• Taproom
• Taproot
• Target
• Taskmaster
• Tattletale
• Taxicab
• Taxpayer
• Teacup
• Teammate
• Teamwork
• Teapot
• Teardrop
• Teaspoon
• Teenager
• Telltale
• Tenderfoot
• Tenderhearted
• Tenderloin
• Tenfold
• Textbook
• Themselves
• Therefore
• Throwaway
• Throwback
• Thunderbird
• Thunderbolt
• Thundershower
• Thunderstorm
• Timekeeper
• Timepieces
• Timesaving
• Timeshare
• Timetable
• Today
• Together
• Toolbox
• Toothbrush
• Toothpaste
• Toothpick
• Touchdown
• Township
• Turnabout
• Turnaround
• Turnbuckle
• Turncoat
• Turndown
• Turnkey
• Turnoff
• Turnover
• Turntable
• Typewriter
• Underachieve
• Underact
• Underage
• Underarm
• Underbelly
• Underbid
• Undercharge
• Underclothes
• Undercover
• Undercurrent
• Undercut
• Underdevelop
• Underdog
• Underesimate
• Underestimate
• Underexpose
• Underfeed
• Underfinance
• Underfoot
• Underfur
• Undergarment
• Undergird
• Undergo
• Undergraduate
• Underground
• Undergrowth
• Underhand
• Underhanded
• Underlayer
• Underlie
• Upbeat
• Upbringing
• Upcoming
• Update
• Updraft
• Upend
• Upgrade
• Upheaval
• Upheld
• Uphill
• Uphold
• Upkeep
• Upland
• Uplift
• Uplink
• Upload
• Upmarket
• Upon
• Uppercase
• Upperclassman
• Uppercut
• Uppermost
• Upright
• Uprising
• Upriver
• Uproar
• Uproot
• Upset
• Upshot
• Upside
• Upstage
• Upstairs
• Upstanding
• Upstart
• Upstate
• Upstream
• Upsurge
• Upswing
• Uptake
• Upthrust
• Uptight
• Uptime
• Uptown
• Upturn
• Upward
• Upwind
• Waistband
• Waistcoat
• Waistline
• Walkout
• Walkways
• Wallboard
• Walleyed
• Wallflower
• Wallpaper
• Wanderlust
• Wardroom
• Warehouse
• Warfare
• Warhead
• Warlike
• Warlord
• Warmblooded
• Warmhearted
• Warmonger
• Warpath
• Warplanes
• Warship
• Wartime
• Washboard
• Washbowl
• Washcloth
• Washout
• Washroom
• Washstand
• Washtub
• Wastebasket
• Wasteland
• Wastepaper
• Wastewater
• Watchband
• Watchcase
• Watchdog
• Watchmaker
• Watchman
• Watchtower
• Watchword
• Watercolor
• Watercooler
• Watercraft
• Waterfall
• Waterfowl
• Waterfront
• Waterline
• Waterlog
• Watermark
• Watermelon
• Waterpower
• Waterproof
• Waterscape
• Watershead
• Waterside
• Waterspout
• Watertight
• Waterway
• Waterwheel
• Waterworks
• Wavelength
• Wavelike
• Waxwork
• Waybill
• Wayfarer
• Waylaid
• Wayside
• Wayward
• Weathercock
• Weatherman
• Weatherproof
• Weekday
• Weekend
• Weeknight
• Whatever
• Whatsoever
• Wheelbarrow
• Wheelbase
• Wheelchair
• Wheelhouse
• Whitecap
• Whitefish
• Whitewall
• Whitewash
• Widespread
• Wipeout
• Without
• Woodshop
• Workplace
• Worldwide
• Wrongdoing

Compound Words | Images

The words pancake, living room, and merry-go-round have something in common.

They are all examples of compound words.

The noun compound means something made up of two or more separate components. Compound can also be an adjective meaning consisting of two or more parts or components.

A compound word is one word, or one unit of meaning, that is created by joining two or more separate words together.

What Are Compound Words?

A compound word is a word made up of usually two but sometimes more words that are joined together. The two (or more) that make the compound word are independent words; they have their own distinct meanings. When those words are joined and form a compound word, that compound word has its own new meaning.

The Three Types of Compound Words

Compound words can take three possible forms: closed, open, or hyphenated. In closed form, there is no space between the joined words. In open form, there is a space between the “joined” words that still act as one unit, and in hyphenated form—you guessed it! There is a hyphen between the joined words.

These general “rules”—which are somewhat fluid and flexible—provide guidance as to what format a compound word takes.

• Closed compound words are usually nouns: They put on makeup.

• Open compound words are usually nouns or verbs: I have to make up (verb) that exam at my high school. (noun)

• Hyphenated compound words are usually adjectives or adverb-adjective combinations: I have to take a make-up (adjective) exam. I will be well-prepared. (adverb + adjective)

The key word in each of those examples is “usually.” Some compound words break the rules. We’ll see how soon.

1. Closed Compound Words

To review: closed compound words are usually made up of two separate words that are put together to form a new word. There is no space between the two words in a closed-form compound word; the compound appears as one single word.

Examples of Closed Compound Words

• Cup + cake becomes cupcake

• Basket + ball becomes basketball

• Key + board becomes keyboard

• Extra + ordinary becomes extraordinary

• Birth + day becomes birthday

You can see through these examples that the meaning of the compound word is not just a merger of the independent definitions of the individual words that join together to make that compound.

However, there is a relationship between the individual word meanings and the compounds. Compound words have been integrated into language as speakers have discovered those relationships. It makes perfect sense to call a cake that could fit into a cup a cupcake and to call a ball thrown through a basket (now a hoop) a basketball.

The rules for compound words, listed earlier in the post, include the word usually. That word means the rules are not hard and fast, and there are examples of compound words that break those rules.

For example, compound words that are verbs are usually open form, but here are rule-breaking closed-form compound verbs that remind us to hold those rules loosely:

• I need to proofread my essay.

• I think the clerk shortchanged me.

• I have to babysit my little sister.

2. Open Compound Words

In an open compound word, there is a space between the two independent words, though they are still treated as one unit with a new “compound meaning.”

Examples of Open Compound Words

• Living room: as a unit, this compound noun refers to a room in a house.

• High school: as a unit, this compound noun refers to a school that has students in grades 9-12.

• Post office: as a unit, this compound refers to a building where mail is collected, sorted, and sent.

• Give up: as a unit, this compound verb means to stop trying.

• Ask for: as a unit, this compound verb means to request something.

3. Hyphenated Compound Words

Hyphenated compound words have hyphens between each of the independent words that serve as connectors. The hyphens are a visual cue that the words form one unit.

Some compound words are always hyphenated.

• Merry-go-round

• Mother-in-law (and brother-, sister-, and father-in-law)

• Self-esteem

Did you notice that all of those examples are nouns? Remember: the rules are flexible!

Examples of Hyphenated Compound Adjectives:

When compound words are used as adjectives (officially known as compound adjectives), the hyphenation rules change depending on where the compound adjective comes in the sentences.

If the compound adjective comes before the noun it modifies (describes), you should usually add a hyphen:

• High-speed chase

• Part-time employee

• Full-time job

• Fire-resistant pajamas

• Good-looking person

• Well-respected politician

• Up-to-date records

Of course, there are exceptions. Remember, those “rules” are flexible. Some compound adjectives that precede the nouns they modify never take a hyphen. For example, ice cream and high school:

• High school students
• Ice cream sundae

There’s really no “why” to explain these exceptions; we’ve just adopted these forms and made them part of our language.

Examples of Open-Form Compound Adjectives

If the compound adjective comes after the noun it modifies, the hyphen is usually omitted.

• Make sure the files are up to date. “Up to date” modifies, but comes after, the noun “files.”

• The cat is two years old. “Two years old” modifies, but comes after, the noun “cat.”

Though post-noun modifiers don’t technically take hyphens, according to Merriam-Webster, usage trends indicate the hyphens are often included anyway, if the compounds “continue to function as unit modifiers.” So there’s that flexibility again.

What About Adverb Compounds?

It’s easy to find examples of closed, open, and hyphenated adverbs.

As for the closed-form examples, we probably don’t even register them as compound words much of the time.

• Sometimes

• Thereafter

• Somewhere

Open-form adverbs occur when the adverb is the first word in the compound and ends in —ly. You should not hyphenate after an —ly adverb.

• We made the discovery early on.

• Her opinion is highly regarded.

• They entered the dimly lit room.

What to Do If You’re Not Sure Which Form Is Right

While those flexible rules can help you, there may still be times when you feel confused about which compound form to use. Don’t stress too much.

According to Merriam Webster, the rules are more like patterns. You may see differences in different publications depending on editorial choice and style. For example, I looked on Amazon for a teapot. I saw mostly teapots, but also a few tea pots. Out of curiosity I put “tea pot” into a New York Times search bar, and found articles from the 1800s that included “tea-pot” in the title!

While interesting, those stylistic changes and choices shouldn’t be too surprising. Language is fluid and ever-evolving. Compound words themselves are proof of that evolution.

Keep Clarity the Focus

The purpose of hyphens in compound words is to ensure clarity. For example,

• I bought over-the-counter medication.

• He passed the medicine over the counter.

In the first example, I know by the hyphen that the medicine «I» bought did not require a prescription. «Over-the-counter» is one unit—one compound—describing a type of medicine.

In the second example, «over the counter» is serving another purpose and, while the words form a phrase to tell me where «he» passed the medicine, hyphens do nothing to make the purpose of the phrase clear and are therefore unnecessary.

Now look at these examples:

• He owned a little-used car.
• He owned a little used car.

In the first example, I know the man owns a car that has not been driven much. The car is described by the compound modifier «little-used.»

In the second example, it seems that the man owns a used car that is also small, or little. In this example, putting a comma after «little» would help to separate the two words, «little» and «used,» and show that they aren’t intended to work as a compound.

ProWritingAid Can Help

Though you’re a compound-word expert now, if you find yourself with lingering doubts, remember that ProWritingAid is here to help. It will let you know if you’ve added an unnecessary hyphen after an -ly adverb, or if you’ve left one out of a pre-noun compound adjective. You don’t have to write alone!

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The final type of compound words are hyphenated compounds. These are words that — just like closed and open compounds — are frequently used together. The hyphen connects these words, so they function as one unit.