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.
cloak clack clock cloaca calk clag cloacae clog colog click kulak cleek cluck caulk colloquia colugo calico cloque cloggy claque kulaki colicky cowlick killock coeliac collogue colloquy klik colleague
cloak alack kulaki killock lake flaky hillock flack bullock bloke flak block bleak slack relook tilak pollock shlock plack black look flake pollack mullock kulak clock flock clack lakh laky lack leak loca lock slake rowlock shellack relock shylock
calo claw clay cloy coal coala coaly cola coagula local locale locally