/ 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: pallid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language