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.
prod proud parody period pard parodoi pored perdu pardy pared purda prude perdy pride preed pardi pried peered purdah parade purred parred protea pardie perdie poured protei pardee pureed pardah perdue paired parrot pierrot proette peridia parried parroty port prat part pert priedieu pirouette party peart prate pruta purty