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.
feud feued fud fed feed feod fuddy fet fid fad feta fete feat fade fado fate food fido feet vied faddy fytte