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.
fireable friable fireball fribble variable furbelow variably verbal
fireable hireable shareable warble hirable sharable wearable trueblue treble durable pourable marble grabble garble curable hearable triable variable wirable errable brabble bearable barrable arable rabble parable drabble tearable friable