/ Thesaurus / B Synonyms of boat whistle Find synonyms for: Noun1. boat whistle, whistleusage: a whistle on a boat that is sounded as a warningWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language