/ Thesaurus / P Synonyms of plain flour Find synonyms for: Noun1. plain flour, flourusage: flour that does not contain a raising agentWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language