/ Thesaurus / S Synonyms of sound truck Find synonyms for: Noun1. sound truck, truck, motortruckusage: a truck equipped with a loudspeaker and used for advertisingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language