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.
pierrots parrots periods proteus peritus proteas pirouettes proteose yperites protease parietes proettes prats ports parts prods prides perdus pyrites perdues parties parodos parados pirates parities parodies protozoa purities pretties pyritous priedieus pards prates prudes purdas
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