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.
koel keel kolo kohl kola kelly koala col cowl coal cola kilo goal kill cole coly kail cool gaol kale coil coala coaly colly cooly coyly golly quell quoll