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.
parroter partier pearter parterre perter porter prater prouder prodder parader purtier portiere prettier parador prudery predry pretor
garroter parroter artery barrater barter ferreter frater heartier artier hurter carrotier courter cowriter grater rioter rater pearter porter purtier sorter dirtier tartier trotter wartier charter shirtier curter writer krater rootier quartier router narrater quarter grouter garter rotter crater garotter courtier carter rooter irater rotor partier perter prater rewriter darter tarter triter ureter charioteer chertier shorter
parrot parroty parodoi parody parred parried sparoid sparred