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.
calo callow call caul cloy coal coala coaly calla callee gal col cowl cool clue cole goal clay clew kale coil gala claw kail gaol gale kolo cull kilo coly cola gall glow cooly quail colly cully galah coyly gayly gaily galea koala gally quale