/ Thesaurus / C Synonyms of clotbur Find synonyms for: Noun1. burdock, clotbur, subshrub, suffrutexusage: any of several erect biennial herbs of temperate Eurasia having stout taproots and producing bursWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language