Synonyms for leaven Found 3 synonyms across 2 meanings for “leaven”. a substance used to produce fermentation in dough or a liquid (noun) leavening cause to puff up with a leaven (verb) raiseprove Explore Related Words Rhymes with leavenSynonyms for leaveningSynonyms for raiseSynonyms for prove Synonym Finder | Rhyme Finder | Poetry Editor