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.
part peart party parity parrot pard prat pert port parroty pardi pardy pared purty prate purity pardee pretty pyrite pirate pardie parade parred parody periti paired pardah protei pierrot yperite parried proette parodoi prod pirouette perdu preed pride pried proud prude pruta purda perdy pored
art boart fart hart heart cart kart quart mart part peart dart tart wart chart
par para parae pare pareo pareu pariah parr parry