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.
proteus proteas proteose proettes protease prates peritus pyrites pirates parrots parties pirouettes pierrots prods prats pyritous purities parts parities parietes yperites ports pretties parodies priedieus prudes perdus prides parados parades periods parodos perdues produce protozoa pards purdas pardahs purdahs
proteus riotous rotes rottes routes fortes courteous croutes garotes garottes garrotes garrottes proteas reroutes tortes