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.
boocoo bookoo bock book bookie bog
coocoo boocoo coo bookoo jocko coco cocoa cook cuckoo loco poco socko