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.
gal goal gall gale gala gaol gayly galea gaily gally galah galley gul galeae goalie calo gley glia glow kail gull coal call caul glue kale glee quale koala calla coala coaly gluey gully golly quail guile callee callow gulley qualia