/ Thesaurus / R Synonyms of rosebay willowherb Find synonyms for: Noun1. fireweed, giant willowherb, rosebay willowherb, wickup, Epilobium angustifolium, willowherbusage: tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plantWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language