/ Thesaurus / B Synonyms of boom out Find synonyms for: Verb1. boom, boom out, sound, gousage: make a deep hollow sound; "Her voice booms out the words of the song"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language