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.
grots groats grouts griots grottos garotes grits garrotes grottoes garottes gratis grates greats greets garrottes garrets carrots croutes carts crits grads grids karts crates krauts karats carats korats quarts curtsy crowds credos gourds grades gradus kraits guards greeds cruets cartes quirts courts carets kurtas grides curets caritas curtesy gourdes carates curtsey creates curates karates curites quartos quartes corrodes courtesy crowdies curettes corodies keiretsu keratose cowrites corrodies courteous
rots tarots trots parrots pierrots grots carrots rats burets fortes hurts quartos fortis girts rotes boarts parts ferrets curets hairdos riots quarts crits courts curtsy rotas certes trets prats karats roots rets sorts terrets shorts sheroots cheroots chariots worrits weirdos turrets jurats torts tortas drats frets vertus virtus derats merits garrotes cartes garotes frats airts artsy ordos writs nerts rotos heriots quartes orts hearts territs brats marts carats ruts forts frits garrets verts bruts brits tortes carts karts arts grits kurtas rods routs korats morts ports carets darts barrets groats griots quirts aortas rotis borts grouts prods berets harts dirts sarods droits tarts farts trouts warts whorts worts charts cherts shirts yurts
grotto grot grotty garote garotte grat grate griot grit gritty groat grody grout grouty