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.
karates karats carates karts korats grates krauts carats kraits cartes crates garotes curates creates quartes garottes garrotes keratose carts garrottes greats grades quarts gratis carets groats curtesy carrots croutes garrets quartos caritas cardias curites grottoes curettes courtesy keiretsu corrades cowrites crits cards grads grots courteous grits creds crudes quartz griots creeds curets grouts cairds grides greeds greets kurtas courts curtsy cruets gradus guards credos quirts curtsey gourdes grottos
rates urates deaerates serrates phorates narrates carates cerates aerates berates crates ferrates borates curates gyrates hydrates prates orates pirates derates karates grates rats certes karats grades aretes irades fortes garotes variates curites forties laureates sorties gratis brutes courtesy cartes norites charades virtues cerites seriates curtesy yperites dirties treats kraits ferrites tortes groats traits barites writes pyrites sorites trades quartes rewrites creates rites verites frites frats krauts korats muriates rotes brats jurats lariats parades garrotes hearties carats parties cowrites corrades greats diorites prats drats ratos tirades treaties barytes derats erratas shorties
karat karate kart carat carate korat krait kraut