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.
prey pry pere pray pyre pore pree pare pure perea pareu parae perry peery pareo parry puree pereia peerie par pro per pur puri pear proa prao prau para peer peri prow pier poor pour pair parr purr pyro hyper poori
grey murrey prey surrey trey re