/ Thesaurus / W Synonyms of water horehound Find synonyms for: Noun1. water horehound, Lycopus americanus, herb, herbaceous plantusage: aromatic perennial herb of United StatesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language