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.
klepto clept yclept gluepot clapt clipt cleped kelped coalpit galipot ycleped clupeoid clypeate gallipot
klepto leapt lept lepta beleapt clept gluepot yclept slept
clepe kalpa kelep kelp kelpie kelpy