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.
prattle protyle prettily partly pertly portal portly protyl peartly predial pretell parietal peridial praedial proudly
rattle brattle prattle rattly brittle dartle
prat pirate prate pretty sprat uprate