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.
cook cooky cookey cookie coco cock kook coke gook coky gooky kooky cocoa cocky kookie coocoo cuckoo cog gogo caky coca cake guck keck kick cuke gowk cacao cakey guaco kicky quack quick
book hook cook gook kook look nook rook sook took chook shook
coo cooee cooey coocoo cook cookey cookie cooky