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.
clept yclept clapt clipt cleped klepto coalpit gluepot ycleped clypeate clapped clipped clopped clupeid galipot clupeoid gallipot
lept clept yclept slept leapt lepta beleapt clapt clipt coalpit gluepot klepto pulpit slipt shilpit
clepe clap clip clop clypei culpa culpae