Compound Nouns: A compound noun is a noun that is made with two or more words. A compound noun is usually [noun + noun] or [adjective + noun], but there are other combinations. Each compound noun acts as a single unit and can be modified by adjectives and other nouns.
There are three forms for compound nouns: 1. open or spaced - space between words (tennis shoe) 2. hyphenated - hyphen between words (six-pack) 3. closed or solid - no space or hyphen between words (bedroom)