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.
rococo recock recook
coco rococo coca cock cocoa coocoo cook cuckoo acock bawcock haycock peacock recock recook seacock
roc rock rocky rook rookie rooky arco brock brook brookie frock croc crock crook trock