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.
capote caput coapt caped capita capped copout coopt kaput coped gaped cooped copied copped couped cowpat cupped gapped gawped kaputt
capote sapote pot sapota teapot repute depot repot spot pupate spite copout sopite bowpot epode boughpot pout poet pate hypoed spate spode spout depute tiptoe