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.
gayness gooeyness coyness canes kanes gains guans guanos canoes guanase goannas guineas gooneys guanays gunnies goonies cans guns keenness cones canso gowns cains kains kaons goons kines koans kanas cannas coneys conies koines queans gainsay
coyness gooeyness feyness shyness wryness gayness ness woeness gneiss waeness fewness dynes leanness dueness vainness keenness rawness lioness finesse dunness meanness tynes newness wanness nowness lowness