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.
goal gal goalie gala gaol gale coal gall gally coala galah galea coaly koala golly gaily gayly galley galeae gul col glee calo coil glia cowl cole kail coly glue gley caul kolo gull cool call glow kale cola koel kohl kola guile quale quail gully calla gluey coyly cooly colly quoll