/ Thesaurus / J Synonyms of jolly roger Find synonyms for: Noun1. black flag, pirate flag, Jolly Roger, blackjack, flagusage: a flag usually bearing a white skull and crossbones on a black background; indicates a pirate shipWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language