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.
ruddle raddle reddle riddle ruddily rutile rudely ridley radulae radiale redly radial redial radula ritual retile rattle rootle readily reedily rowdily ruttily radialia radially ritually
addle daddle paddle peddle waddle piddle meddle fuddle puddle middle coddle noddle diddle riddle widdle buddle ruddle muddle huddle toddle cuddle raddle reddle fiddle saddle heddle muddly oddly odyle nodule caudle dale dawdle sedile aedile piddly needle waddly poodle diddly sidle module diddley puddly noodle medley ridley fiddly dole dele ladle padle idle boodle tiddly doodle audile cuddly beadle wheedle edile yodle
rudd ruddy redd rude rued crud cruddy crude prude