A noun is a word used to identify people, places, or things. A compound noun has the same function but is made up of two or more words. It could be a noun plus another noun, or a noun plus a verb, adjective, adverb, or preposition, or a prepositional phrase. Or it can be a verb plus an adjective, adverb, or preposition.
cat food |
= |
cat (noun) + food (noun) |
homework |
= |
home (noun) + work (noun or verb) |
swimming pool |
= |
swimming (verb) + pool (noun) |
software |
= |
soft (adjective) + ware (noun) |
onlooker |
= |
on (preposition) + looker (noun) |
offspring |
= |
off (preposition) + spring (verb) |
dry-cleaning |
= |
dry (adjective) + cleaning (verb) |
drawback |
= |
draw (verb) + back (adverb) |
mother-in-law |
= |
mother (noun) + in-law (prepositional phrase) |
tennis shoe |
= |
tennis (noun) + shoe (noun) |
The first part of the compound noun tells us the type or purpose; the second part specifies what the object or who the person is.
The first word describes or modifies the second word.
policeman |
= |
police (type) + man (who) |
swimming pool |
= |
swimming (purpose) + pool (what) |
A compound noun can be written as a single word, hyphenated, or as two words. Most of them are written as one word, but there are no rules. When it’s an established compound noun, your dictionary or spellcheck will provide guidance. But new compound nouns are continuously created – try writing them as one word and if that doesn’t read well, keep them as two words.
Pronunciation
There’s a difference between a compound noun and an adjective plus a noun. In a compound noun, the emphasis is usually on the first syllable.
A greenhouse is a place where you grow plants. (compound noun)
A green house is house that’s painted green. (adjective plus a noun)
©Andrea Paulsen