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.
gook gooky gowk kook cook gogo kooky cooky kookie cookie cookey cock coky guck coco gawk coke cocky cocoa gawky guaco
book hook cook gook kook look nook rook sook took chook shook