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