/ Thesaurus / G Synonyms of genus silphium Find synonyms for: Noun1. Silphium, genus Silphium, asterid dicot genususage: tall North American perennial herbsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: topography Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language