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.
en eon aeon enow eyne ennui
been ben sheen wheen ween teen sen wren pen mien en fen hyphen haen hen gen gien gaen keen ken queen lien hymen men peen rouen seen den ten wen when yen