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.
parton pardon partan proton peritonea hypertonia pardine pertain preteen protein preattune predawn protean puritan pyridine
burton carton parton martin ratton ratoon croton guerdon lardon baritone partan marten proton torten triton chorten rattoon rhyton baryton quartan cardon cartoon cordon cortin craton crouton bourdon hearten tartan pardon tortoni barytone tritone shorten
part party parodoi parody parred parried parrot parroty port peart prate protea pruta purty spared sparoid paired parity pardy pardie pardi pardee pardah pard pared parade pert prat pretty protei prutah apart sparid sparred