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.
kultur culture kelter kilter quilter cloture coulter guiltier gauleiter colter clutter clatter clouter gloater guilder glitter clattery cluttery collator gleetier glittery killdeer
kultur philter milter quilter culture kilter belter bolter colter filature falter filter realter poulter salter pelter tilter palter welter moulter altar philtre halter melter alter coulter kelter jolter jilter cloture vulture vaulter philtra poultry peltry realtor paltry sultry multure ultra molter shelter
cult culti kelt kilt kiltie kilty skulled