/ Thesaurus / F Synonyms of flat cap Find synonyms for: Noun1. cloth cap, flat cap, capusage: a flat woolen cap with a stiff peakWordNet 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