/ Thesaurus / D Synonyms of decomposition reaction Find synonyms for: Noun1. decomposition, decomposition reaction, chemical decomposition reaction, chemical reaction, reactionusage: (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substanceWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language