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.
coly colly cooly coyly coaly col coolly cole clay coil cool cola coal cloy cowl golly coala cully collie coulee coolie cullay calo kolo kohl clew gaol call caul clue goal gley cull koel claw kola calla gaily gally gayly gluey gully kelly koala quoll
holy hooly coly cooly moly poly dooly wooly