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.
coof coff coif goof goofy coffee coiffe cafe caff cove cuff cuif cough covey
hoof coof goof loof poof roof whoof woof of
coo cooee cooey coocoo cook cookey cookie cooky