/ Thesaurus / U Synonyms of upsetter Find synonyms for: Noun1. upsetter, winner, victorusage: an unexpected winner; someone who defeats the favorite competitorWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language