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.
nays naysay naos gnaws nausea nus nos nows nisi nous nazi nosy news ness noes nose gnus wyns knees knows newsy nisei noise noisy noose nosey wynns
ays bays shays ways says rays pays nays mays lays quays kays gays cays jays hays fays days chays yays as