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.
typhons typhoons diaphones diaphonies daphnes daphnias dauphins toughens dauphines toughness diaphanous devons dovens tiffins
phons siphons syphons typhons hyphens phones phonos geophones daphnes dauphins diaphones typhoons