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.
horrible horribly hirable hearable hireable herbal hairball harebell
horrible terrible hearable hirable horribly garble marble parable tearable dribble fribble durable terribly triable warble wirable verbile variable errable curable burble roble bearable barrable barbule arable ruble pourable gribble hyperbole friable treble tribal wearable sharable