/ Thesaurus / R Synonyms of radioactive material Find synonyms for: Noun1. radioactive material, material, stuffusage: material that is radioactiveWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language