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.
caplet capelet couplet cappelletti coplot copilot coupled cupeled cupelled copulate cupolaed cupulate
caplet couplet chaplet ripplet applet wheepled capelet nippled poppled replete rippled toppled epaulet pallet spelt splat pullet suppled deplete plot pleat hoppled replot tippled dappled coupled split pled spilt coplot uplit pellet repled pelt peopled piolet palet plat