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.
reiterate retreat rehydrate retort reuttered retread retard ritard redried retired retried
iterate deuterate reiterate literate stearate laterite maturate citrate patriate outrate nitrate terete federate literati derate deaerate saturate striate butyrate moderate titrate
retear rioter ritter writer criteria triter ureter