/ Thesaurus / T Synonyms of trump card Find synonyms for: Noun1. trump, trump card, playing cardusage: a playing card in the suit that has been declared trumps; "the ace of trumps is a sure winner"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language