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.
party parity part parroty purty pardy peart purity parrot pretty parody pard port pert prat pardi perdy prate pared pardee pyrite pardah parade parred pardie paired periti protei pirate parodoi parried pierrot proette yperite prod pirouette
arty warty party tarty hearty art cart quart hart quarto heart mart caret part treaty karat charity parroty peart purty surety dirty tardy tart ferrety chart shirty dorty cherty ferity carroty tarot verity wart bratty borty boart airt ratty kart parity forty carat carte pardy fart purity rarity dart hardy quarte lardy shorty
par pair para parae pare pareo pareu pariah parr parry pear spar spare sparrow sparry