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.
grottoes grottos garottes garrottes garotes grots garrotes grates grouts griots groats croutes curettes grits gratis greats greeds grides cartes grades greets crates curites quartos curtesy creates curates quartes carrots garrets gourdes carates karates corrodes keratose crowdies courtesy corodies cowrites corrodies grads carts creds karts crits grids kraits quarts krauts gradus curtsy korats credos karats crudes crowds creeds guards gourds curets courts kurtas carats carets cruets quirts
grottoes rottes ariettes barrettes burettes curettes garottes garrottes grottos pirouettes pretties proettes syrettes
grotto grotty grot garote garotte griot gritty groat grout grouty