Insures rhymes with:
ensures, assures, brochures, ensures, reassures, sures, amanpour's, assures, beladur's, boors, brochures, cures, detours, endures, ensures, koors, luehrs, luhrs, lures, matures, moore's, moores, moors, obscures, poor's, poors, reassures, secures, spoor's, sures, tour's, tours, yours
Insures sounds like:
imageries, inaccuracies, inaccuracy, incisors, increase, increases, incurs, ingrassia, injures, injuries, injurious, inquires, inquiries, insurer's, insurers, insurers', ionizers