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.
fusion fashion vision
basion fusion suasion vision lesion nasion kation fashion potion coition nation shin lotion motion cation cushion cushiony notion caution ration mesian tuition