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.
coplot copilot couplet copulate caplet capelet coupled cupulate cappelletti cupeled cupelled cupolaed
coplot replot plot couplet uplit copilot splat caplet spelt ripplet papillote pullout applet plod plat pilot pelt pelota spilt split chaplet
copal copula copulae couple scopula scopulae