/ Thesaurus / P Synonyms of polypropene Find synonyms for: Noun1. polypropylene, polypropene, plasticusage: a polymer of propylene used as a thermoplastic molding materialWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language