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.
colog clog collogue colugo cloggy clag colloquy cloak glogg clock colic colloquia colleague cloaca cloque cloacae coeliac colicky cowlick calk gleg glug
duolog colog log logo blog flog clog glogg sawlog slog dialog
col calo coyly coulee cloy coal coala coaly coil cola cole collie colly coly cool coolie coolly cooly cowl kolo