1. [adj]  (of persons) highest in rank or authority or office; "his arch rival"; "the boss man"; "the chief executive"; "head librarian"; "top administrators"
2. [adj]  (grammar) of a word in a phrase; the word playing the same grammatical role in the sentence that the phrase itself plays; "the head noun in the phrase `fresh fish' is `fish,' which is the direct object in the sentence `I bought fresh fish'"

HEAD(A) is a 7 letter word that starts with H.