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.
ultra
philtra ultra poultry jolter palter molter melter kelter philter jilter tilter poulter halter vaulter philtre salter realter welter kultur colter pelter latria altar paltry moulter milter kilter coulter quilter alter peltry belter bolter elytra sultry realtor falter filter shelter