Insure rhymes with:
reinsure, ensure, reinsure, unsure, assure, brochure, ensure, lesure, reassure, reinsure, schuur, shure, sure, unsure
Insure sounds like:
imagery, imcera, incisor, incur, ingar, inger, ingrao, ingria, injure, injury, inquire, inquirer, inquiry, inscore, insecure, inserra, inshore, insurer, inzer, ionizer