/ Thesaurus / S Synonyms of small arm Find synonyms for: Noun1. firearm, piece, small-arm, gunusage: a portable gun; "he wore his firearm in a shoulder holster"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language