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.
readily reedily redly radially retail redial radial retally ruddily radiale rowdily radialia rattly radula reddle retile raddle rudely radulae rattail ruttily ritually ratal ratel retell retool ridley ritual rutile
beadily shadily headily readily waddly gaudily badly dowdily bawdily seedily bodily ruddily daily reedily dilly muddily meatily madly needily radial giddily rowdily sadly deadly tidily weedily moodily doily shoddily
read radii radio readd ready redia rediae roadie bread bready oread dread tread uredia rad red