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.
ruttily rutile rattly rattail ruddily rudely retile rattle ridley retail readily rowdily retally reedily rotl ritually radially redly ratal ratel redial retool riddle radial ritual rootle retell ruddle radula radiale radulae
fattily tattily ruttily nattily cattily chattily pettily dottily knottily nuttily wittily goutily nettly stilly doughtily meatily sootily rattail cattail coattail rattly haughtily til