Synonyms and related words :
Bronx cheer, bird, boo, catcall, chaps, chops, embouchure, gab, gob, hiss, hoot, jaw, jaws, jowls, kisser, lips, mandibles, maw, maxilla, mouth, mug, mush, muzzle, oral cavity, pooh, pooh-pooh, premaxilla, razz, row, trap, yap