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