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.
guanays guanase guans guanos guns gainsay goannas kanas gains queans cannas guineas gunnies gayness gooneys cans canso kains kaons kanes canes quins kinas cains gowns goons koans canoes coneys kinase queens quinsy quoins goonies quinoas
guanays nays anas saunas nanas annas anoas faenas faunas cannas goannas guanase lianas manas manias mannas kanas ruanas lanais hyaenas
guanay guan guano iguana gan gun