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.
cock cocky coca coco coke coky cook cocoa cooky cookey cuckoo cookie coocoo cog kook caky gook cake kick gowk cuke caca guck keck cacao caeca cakey gooky guaco kicky kooky quack quick
bock hock jock cock lock mock knock nock pock rock sock dock chock shock yock