/ Thesaurus / M Synonyms of mouth harp Find synonyms for: Noun1. harmonica, mouth organ, harp, mouth harp, free-reed instrumentusage: a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired holeWordNet 3.0 Copyright 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: wizened Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language