/ Thesaurus / B Synonyms of boar thistle Find synonyms for: Noun1. bull thistle, boar thistle, spear thistle, Cirsium vulgare, Cirsium lanceolatum, plume thistle, plumed thistleusage: European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United StatesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language