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.
dottily dottel dottle doughtily dowdily tattily dotal tautly tiddly diddly tidily detail diddley totally tidally tidal title total deadly diddle doodle tattle tittle tootle
fattily tattily ruttily nattily cattily chattily pettily dottily knottily nuttily wittily goutily nettly stilly doughtily meatily sootily rattail cattail coattail rattly haughtily til