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.
culpa culpae clap clip clop gulp clepe gulpy kalpa clypei collop calipee calliope callipee glop kelp
culpa lipa julep culpae gulp gulpy kalpa milpa palapa pulp pulpy salpa salpae tulip chalupa
caul coulee cull cullay cully aculei oculi scull