Natwest's rhymes with:
bequests, midwest's, northwest's, norwest's, quests, requests, southwest's, west's, arrests, attests, bequests, best's, breasts, chests, crests, digests, divests, fests, guest's, guests, guests', infests, invests, jests, midwest's, molests, nests, northwest's, norwest's, pests, quests, reinvests, requests, rests, retests, southwest's, suggests, test's, tests, tests', vests, west's