Erstwhile rhymes with:
carwile, meanwhile, anglophile, argyle, carlisle, carlyle, carwile, corbeil, costabile, crocodile, exile, francophile, freestyle, gentile, hairstyle, lifestyle, meanwhile, mercantile, oenophile, percentile, peristyle, profile, reconcile, senile, senkbeil, stockpile, sundial, textile, turnstile, wohlfeil