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.
cleanness cleans cleanse clans coolness clones glueyness clines gleans callowness colones callans gluiness colleens colonies glans glens clons clonus colons glance colins clowns collins colonus galenas kalians cullions galleins galleons guylines kaolines kilns
leanness cleanness alienness villainess plainness realness sullenness