/ Thesaurus / S Synonyms of seconder Find synonyms for: Noun1. seconder, supporter, protagonist, champion, admirer, booster, friendusage: someone who endorses a motion or petition as a necessary preliminary to a discussion or voteWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language