/ Thesaurus / O Synonyms of opposer Find synonyms for: Noun1. adversary, antagonist, opponent, opposer, resister, person, individual, someone, somebody, mortal, soulusage: someone who offers oppositionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language