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.
merle merl merely morale marl merrily morelle marly moral morel mural morula morally morello
merle birle hurley ferly ferlie ferrule farle earl feral orle pearl morelle parley prole beryl pyrrole queerly seral curlew charlie carle chorale virile burley rale parole herl girlie role rule ferule aureole barley areole parle peril rile nerol puerile morale ceorl merl charley curule cheerly creole sheerly