/ Thesaurus / S Synonyms of smoking gun Find synonyms for: Noun1. smoking gun, evidenceusage: indisputable evidence (especially of a crime)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language