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.
cull cully cullay gull caul call quill gully quoll colly calla quell coulee collie coolly callee gulley callow gul col quillai cloy kill clay quillaia coal cole coil claw cola clue coly clew cowl cool gall calo golly quail cooly coala quale kelly guile coaly gally coyly
bull full hull cull gull lull mull null pull dull