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.
radicle radical ridicule radically reticle retackle reticule roadkill reticula
pedicle radicle tickle cuticle lodicule medical nodical radical reticle reticule ridicule stickle