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.
grottos grottoes grots garottes grouts groats griots garrottes garotes grits garrotes greets greats gratis grates garrets quartos carrots croutes keratose curettes grads crits grids carts karts grides guards grades quarts krauts korats cruets courts gourds gradus kurtas carats karats carets crowds crates kraits quirts curets greeds cartes credos curtsy curtesy caritas carates curtsey gourdes karates quartes curites creates curates
grottos riotous rotos rottes garottes garrottes grottoes
grotto grotty grot garote garotte griot gritty groat grout grouty