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.
shelter shielder chelator shoulder
belter shelter kelter melter pelter welter jilter vaulter violater haltere letter plater salter poulter bleater elater politer slater diluter billeter balloter fluter relater fleeter alter liter later coulter joltier bolter quilter milter molter muleteer welder shielder saluter colter palter vaultier dilater siltier peltry saltier fielder faultier moulter pleater realter gauleiter melder miltier philter zoolater wielder tilter polluter halter gelder guiltier elder gleetier kilter maltier jolter falter reletter filter sleetier yielder
shelta sheltie shelty shalt shelled shield