/ Thesaurus / R Synonyms of red underwing Find synonyms for: Noun1. red underwing, Catocala nupta, underwingusage: moth having dull forewings and red-marked hind wingsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language