/ Thesaurus / P Synonyms of periplaneta americana Find synonyms for: Noun1. American cockroach, Periplaneta americana, cockroach, roachusage: large reddish brown free-flying cockroach originally from southern United States but now widely distributedWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language