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.
purty purity party pretty parity port part parroty pert prat pardy pruta purda prate perdy peart pyrite poured purred pureed pirate purdah protei prutah parrot protea periti parody pierrot proette yperite pard prod pirouette
purty verity arty party parity grouty quart curdy court carroty curet jurat hurt charity trouty shirty dorty yurt surety hearty fruity curt dirty rarity purity parroty kurta quirt borty buret rutty ferity ferrety forty cherty warty shorty tarty yurta
pur pour pure puree puri purr spur spurrey spurry