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.
clip clop clap calipee calliope callipee clepe culpa culpae clypei collop glop gulp kelp galop gulpy kalpa kelep kelpy
lip blip fillip flip clip slip tulip