/ Thesaurus / T Synonyms of tommy gun Find synonyms for: Noun1. Tommy gun, Thompson submachine gun, submachine gunusage: a .45-caliber submachine gunWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ravenous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language