compound noun

A compound noun is formed by combining two or more words to create a single word with a distinct meaning. These can be written in three ways: as a single, closed word (e.g., haircut), hyphenated (e.g., high-speed), or as separate words with spaces (open compound, e.g., health care). The meaning of the compound word is often determined by the "head constituent," which is typically the last word in the compound. For example, in "chain saw," "saw" is the head constituent, indicating it's a type of saw. Compound nouns can be formed from various combinations of word types, such as noun + noun (bookstore), verb + noun (rescue team), or adjective + noun (high school).12