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.
colossal colossally glossal clausal closely classily coleslaw glossily callously glassily
colossal glossal loessal loessial
colossi cols calos close cloys coals coils colas coles colessee cools cowls kolos