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.
curl curly curule curial curlew carl carol carle crawl craal cruel creel coral crawly creole carrel caroli corral carrell cariole criollo corolla quarrel cruelly queerly carriole guerilla guerrilla goral graal grail grill growl gruel kraal krill
burl furl hurl curl knurl nurl purl churl
cur cure curia curiae curie curio curr currie curry