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.
caul calo coal cull call calla cully coaly coala callee callow coulee cullay gul gal col clay cloy kail goal gall cool gull clew cowl coil clue coly gaol gala cole gale cola kale claw galea quill gayly quale gaily colly coyly quail galah koala gully gally guile quell cooly quoll
haul caul maul miaul saul waul shaul al