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.
reedily readily redly redial ruddily rowdily radially retell rudely radial retail retile retally ruttily radiale radialia ritually ratel radula rattly reddle retool ridley ritual rutile rattail
needily reedily seedily weedily gaudily shadily dowdily readily tidily moodily deadly daily medley sedile rowdily redial doily muddily redly giddily ruddily headily dilly edile aedile bodily beadily bawdily medial lewdly shoddily
reed redia rediae reedy breed freed creed greed greedy preed dreed treed uredia red