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.
sputa spout septa sapota spot spud spit spat sept spued spite spate spade spait spaed spado sapote sippet sopite spotty sped
sputa put deputy spout septa sapota repute nepeta lepta kaputt kaput copout caput capita putt pout pita depute tapeta