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.
ruddily ruddle rudely readily ruttily reedily rowdily redly radially redial rutile riddle reddle radial raddle ridley radiale radialia ritually radula rattly retail retile ritual radulae rattail retally
muddily ruddily shoddily giddily gaudily dilly shadily waddly tiddly diddly seedily puddly beadily rowdily readily piddly daily bodily doily weedily moodily muddly needily headily oddly diddley reedily dowdily fiddly tidily cuddly bawdily