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.
purfle prefile profile parafoil prevail privily prevalue
purfle farfal truffle tearful profile prefile carful jarful fearful farfel earful raffle barfly ruffle rifle riffle reflew refile deerfly trifle cheerful