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.
ghoul ghoulie foul ghyll foully ghillie foal foil fool fowl fuel full viol vole
ghoul joual shool sheol cholo chola whole doula soul joule hull boule hula howl holy hole haul foul shaul shoal shul