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.
couplet coupled caplet coplot capelet copilot cupeled copulate cupelled cupolaed cupulate cappelletti
couplet palet pleat pullet applet epaulet capelet caplet coupled replete ripplet deplete uplit chaplet
couple copal copula copulae cupel cupola cupula cupulae cupule