/ Thesaurus / R Synonyms of riot act Find synonyms for: Noun1. riot act, rebuke, reproof, reproval, reprehension, reprimandusage: a vigorous reprimand; "I read him the riot act"2. Riot Act, lawusage: a former English law requiring mobs to disperse after a magistrate reads the law to themWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language