Noun | 1. | headword - a content word that can be qualified by a modifier content word, open-class word - a word to which an independent meaning can be assigned phrase - an expression consisting of one or more words forming a grammatical constituent of a sentence |
2. | headword - a word placed at the beginning of a line or paragraph (as in a dictionary entry) word - a unit of language that native speakers can identify; "words are the blocks from which sentences are made"; "he hardly said ten words all morning" dictionary entry, lexical entry - the entry in a dictionary of information about a word |