/ Thesaurus / S Synonyms of synthetic rubber Find synonyms for: Noun1. rubber, synthetic rubber, synthetic, synthetic substanceusage: any of various synthetic elastic materials whose properties resemble natural rubberWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language