/ Thesaurus / R Synonyms of reed organ Find synonyms for: Noun1. harmonium, organ, reed organ, free-reed instrumentusage: a free-reed instrument in which air is forced through the reeds by bellowsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language