Voltaren rhymes with:
motoren, uterine, veteran, aldebaran, amparan, anaren, andren, askren, bargeron, bundren, cameron, catherine, coldren, condren, corcoran, cothren, fondren, halloran, hefferan, hefferon, hendren, holdren, holleran, holloran, killoran, lutheran, mandarin, margarine, milliron, motoren, nitroglycerin, nitroglycerine, o'hallaron, o'halloran, o'halloron, ohalloran, operan, orgeron, pickren, saccharin, saharan, tamarin, tiberon, uterine, veteran