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.
coupled couplet cupeled cupelled cupolaed copulate cupulate caplet coplot capelet copilot cappelletti
coupled pled uppiled tippled supplied spiled rippled repled reapplied poppled paled piled plead plied poled puled pulled applied hoppled couplet cupeled lapeled nippled peopled rappeled replead replied sepaled suppled dappled toppled wheepled
couple copal copula copulae cupel cupola cupula cupulae cupule