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.
cocky cock coky cooky cookey coca caky coco cook coke cakey cocoa kicky gooky kooky cookie quacky coocoo cuckoo cog caca cuke gook gowk guck keck kick kook cake
cocky rocky pocky chucky tokay whacky dock tackey socko dickey gooky rooky knock bock jock cookey joky chokey yock jocko caky icky jockey hickey okay mock picky lucky jacky hooky poky rock jokey nooky quacky mucky nock hokey kooky hookey oaky kicky coky cooky hock hoick lock hockey pokey pecky pock rickey mickey lackey cock sock sucky dicky ducky tacky wacky chock choky shock yucky
cocky cock jockey jock hockey hock bock cookie mock cuckoo pock rock sock dock choke choky jocko coco coca cocoa coke coky coocoo cook cookey cooky lock nock pocky rocky socko chock chokey yock