/ Thesaurus / C Synonyms of common ageratum Find synonyms for: Noun1. common ageratum, Ageratum houstonianum, ageratumusage: small tender herb grown for its fluffy brushlike blue to lavender bloomsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: laudable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language