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.
variable variably friable fribble verbile fireable verbal
friable variable triable sharable tearable wearable pourable fireable fribble grabble curable horrible hireable hirable hearable variably marble bearable errable barrable arable rabble garble gribble parable drabble durable terrible brabble dribble warble wirable shareable