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.
classily glassily glossily clausal closely colossally glazily colossal callously glossal calyceal
flossily classily glassily glossily loessial lousily blousily blowsily viewlessly joylessly lawlessly soullessly
class classy clause claws clays colas glass glassie glassy