Is become a compound word

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Is become a compound word?

Yes it’s a compound word. Think of words like: cupcake (two separate words with two different means coming together to make an altogether different word), treehouse, doghouse. It’s a verb, that I’m aware of full on.

Can fire exist without oxygen?

A fire cannot burn without oxygen. The burning that a star does, then, is a nuclear reaction, and not a chemical one like the fires on Earth (when a candle burns, the atoms themselves remain unchanged: just the molecules are affected).

What does fire stand for?

Financial Independence, Retire Early

Does fire absorb oxygen?

Air contains about 21 percent oxygen, and most fires require at least 16 percent oxygen content to burn. Oxygen supports the chemical processes that occur during fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.).

How can we sustain fire?

Keeping a fire burning is a cycle. Start with tinder, then add kindling, and finally wood….Use dry firewood.

1. Stay away from recently chopped trees, as they have a lot of water still and won’t contribute to a sustaining fire.
2. Seasoned firewood is the best, because it has been left to dry out for months or even years.

Is the sun on fire?

Answer: The Sun does not “burn”, like we think of logs in a fire or paper burning. The Sun glows because it is a very big ball of gas, and a process called nuclear fusion is taking place in its core.

Can fire burn without fuel?

There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

Can fire burn underwater?

Originally Answered: Can fire occur underwater? Yes. If you supply fuel and oxidizer. There are also flares that burn underwater.

What is tetrahedron of fire?

A tetrahedron can be described as a pyramid which is a solid having four plane faces. Essentially all four elements must be present for fire to occur, fuel, heat, oxygen, and a chemical chain reaction. Each of the four sides of the fire tetrahedron symbolise the Fuel, Heat, Oxygen and Chemical Chain Reaction.

What is burning without oxygen called?

Incomplete combustion will occur when there is not enough oxygen to allow the fuel to react completely to produce carbon dioxide and water. As is the case with complete combustion, water is produced by incomplete combustion; however, carbon, carbon monoxide, and hydroxide are produced instead of carbon dioxide.

How do you burn in absence of oxygen?

Pyrolysis, which is also the first step in gasification and combustion, occurs in the absence or near absence of oxygen, and it is thus distinct from combustion (burning), which can take place only if sufficient oxygen is present.

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.