Synonyms for insure Found 11 synonyms across 3 meanings for “insure”. be careful or certain to do something (verb) seecheckensurecontrolascertainassure make certain of (verb) guaranteesecure protect by insurance (verb) coverunderwrite Explore Related Words Rhymes with insureSynonyms for seeSynonyms for checkSynonyms for ensureSynonyms for controlSynonyms for ascertain Synonym Finder | Rhyme Finder | Poetry Editor