A compound word is made of two or more words. Some compound words are hyphenated (high-tech, low-cost), some are written as one word (brainstorm, railroad), and others are written as two words (high school, post office). If you are not certain about the form of a particular compound word, check a dictionary. The meaning of a pair of words can depend on whether they are written as one word or two (green house /greenhouse, blue book/bluebook).

Plurals of compound nouns are formed by adding s to the most important word.

bird-watchers, also-rans, sweethearts, raincoats, mothers-in-law, passersby Possessives of compound nouns are formed by adding 's to the last word.

the policeman's reaction, the mother-in-law's secret For capitalization of compound words in titles, see capital letters.

 

 

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