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.
parrots parts pierrots parados proteus parties proteas parodos parodies prats proteose ports pards parities prods parietes proettes protease prates pirouettes parades pyrites pirates peritus periods pardahs pyritous protozoa pretties purities paradise yperites perdus prides prudes purdas perdues produce purdahs
carrots parrots pierrots rots cheroots roots worrits rotas riots rotos territs ferrets tarots rotis rotes grouts trouts groats griots barrets grots droits heriots terrets garotes trots garrets turrets garrotes chariots routs sheroots
parrot parroty parodoi parody parred parried sparoid sparred