Compound nouns are two nouns put together. When we combine the two nouns to make a compound noun, we are making a new word.

bed + room = bedroom

• I bought a new bed.
• My house has 4 rooms.
• I study in my bedroom.

Here is a list of the most common compound nouns.

armchair	aircraft	background	baseball	bedtime
brainstorm	butterfly	catfish	chopstick	daydream
dishwasher	driveway	dustpan	earring	earthquake
eggplant	eyelid	eyelash	fingerprint	fireman
firefly	flashback	footprint	grapefruit	hallway
heartbeat	keyhole	kneecap	ladybug	landslide
mailbox	marketplace	notebook	notepad	pancake
password	quicksand	rainbow	railway	sailboat
seashell	vineyard	waistline	wallpaper	workshop

Sometimes two nouns are used together, but they are not one word. However, if you remove one of the words, then the meaning changes.

cell phone	elementary school	full moon	high school
hot dog	life jacket	light bulb	orange juice
post office	real estate	vacuum cleaner	video game

Some compound nouns have a hyphen or two.

brother-in-law	father-in-law	get-together	merry-go-round
mother-in-law	self-esteem	self-service	sister-in-law

You will naturally learn compound nouns as you continue to study and learn English, so you do not need to spend a lot of time studying compound nouns. But it is important to understand this basic English grammar.