/ Thesaurus / B Synonyms of ballota nigra Find synonyms for: Noun1. black horehound, black archangel, fetid horehound, stinking horehound, Ballota nigra, herb, herbaceous plantusage: ill-smelling European herb with rugose leaves and whorls of dark purple flowersWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fortuitous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language