Censor- an official who watches others for correct behavior.
Currency- something, such as coins or paper money, that is used as a medium of exchange.
Waterwheel- a wheel made to turn by the water flowing against it.
Acupuncture- originally, a Chinese practice of inserting fine needles through the skin at specific points to treat disease or relieve pain.
Network- a connected group or system.
Link- a connecting element or factor.