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.
kalpa kelp kelep kelpy galop culpa culpae gallop kelpie calipee calliope callipee clap clip clop glop gulp
kalpa salpa alp tilapia lipa jalap jalop culpa culpae galop milpa palp palpi salep salp salpae palapa chalupa