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.
cloaca cloacae clack cloak clock coeliac clag clog click colic cluck colog colloquia claque cloggy cloque colugo colicky cowlick gallica killock kolacky collogue colloquy
calo claw clay cloy coal coala coaly cola coagula local locale locally