I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
cupulate copulate cupolaed coupled couplet cupeled cupelled caplet coplot capelet copilot cappelletti
cupulate copulate populate palate paleate palliate pileate plate appellate epilate oppilate papillate replate spoliate depilate toeplate
cupulae cupula cupule copula copulae couple cupel cupola