/ Thesaurus / W Synonyms of warning device Find synonyms for: Noun1. alarm, warning device, alarm system, deviceusage: a device that signals the occurrence of some undesirable eventWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language