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.
wrapt rapt wrapped raped rapid repot rapped reaped repeat repute roupet
wrapt rapt apt caput coapt kaput leapt teapot chapt
wrap rap trap drape grapy grappa grapey grape crappy crappie crape crap frappe frap reap rappee rape drapey warp