/ Thesaurus / J Synonyms of jell o Find synonyms for: Noun1. jello, Jell-O, gelatin dessert, hydrocolloidusage: fruit-flavored dessert (trade mark Jell-O) made from a commercially prepared gelatin powderWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language