WAIST The midship section of a ship between bow and stern.
WARDROOM The officers common room in a Naval vessel and also used in some Merchant ships.
WATCH The period of time on duty aboard ship.
WILLIAMSON TURN A formal manoeuvre to turn a ship 180 degrees rapidly and return to the same point on the course. Used to recover persons overboard.
WORKAWAY A person who works his way on board a ship for a free passage. He is not a crewmember but gets a berth and food. Rare in British Merchant Navy but fairly common in Scandinavian ships. I came from the West Coast of Canada to the Netherlands on a Norwegian ship one time.
ZENITH The highest point of a celestial bodies transit. It is the point at which we measure, with the sextant, the Sun to obtain the Latitude.
Hope you enjoyed these nautical words.