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.
glassily classily glossily glazily glossal colossally clausal closely colossal callously glycyl
flossily classily glassily glossily loessial lousily blousily blowsily viewlessly joylessly lawlessly soullessly
glass glassie glassy class classy galas glias gloss glossa glossae glossy