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.
philter philtra philtre filter violater falter fluter flitter fielder flatter fleeter flutter floater vaulter flouter faultier filature flattery vaultier fluttery violator folder flooder flutier flytier vulture
filter philter milter quilter jilter kilter tilter elater plaiter vaultier gauleiter balloter coulter molter guiltier later melter violater jolter colter saluter philtra poulter belter billeter fluter halter bolter kelter haltere guilder builder gilder wilder philtre welter joltier maltier litter flitter loiter faultier palter liter saltier alter diluter siltier relater falter glitter dilater slater vaulter politer milder miltier moulter pelter plater polluter realter salter slitter zoolater shelter