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.
clop collop clap clip glop culpa galop clepe calliope culpae gloppy gallop clypei calipee callipee gulp kelp gulpy kalpa kelep kelpy
lop flop jalop clop collop gallop galop glop lollop plop slop dollop wallop shallop