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.
diddly diddley tiddly diddle tidily deadly daddle tidally dowdily dottily dedal tidal doughtily daedal dawdle detail doodle toddle tattily
fiddly piddly cuddly diddly oddly tiddly puddly waddly muddly rowdily deadly noddle madly needily duly seedily redly piddle moodily saddle muddle paddle ridley goodly raddle puddle reedily reddle ruddily rudely sadly daddle diddle cuddle toddle widdle beadily shadily loudly waddle coddle buddle idly riddle diddley dowdily gaudily lewdly readily peddle muddily huddle badly giddily middle godly nudely heddle ruddle headily fiddle bodily addle medley fuddle bawdily tidily weedily widely meddle shoddily
did daddy didie dido didy died diode duddie duddy giddied kidded lidded ridded