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.
coulter colter clouter colder clatter quilter culture clutter collider clattery guiltier cluttery coleader colluder collator cloudier gauleiter kultur kelter golder kilter cloture clowder caldera gloater guilder glitter cloddier gleetier glittery glider gladder gladier
vaulter poulter coulter moulter realter diluter liter slater bolter salter kelter aulder flutier halter jilter filter flouter zoolater shelter ultra fluter later philter faultier politer kultur maltier milter molter vaultier joltier pelter saluter haltere clouter boulder saltier dilater poultry siltier clutter relater jolter moulder billeter falter colter alter flutter welter sultry tilter elater violater belter balloter guiltier kilter quilter melter miltier palter plater polluter shoulder
colt cult clout could culet culotte culti