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.
smuttier smatter smiter scimiter summiteer semidry simitar cemetery scimetar scimitar summitry symmetry
smuttier matier matter mattery meatier metier mitier mutter embitter emitter imbitter omitter remitter smatter