Rudder. A device for steering vessels. Hinged to the outside of the hull, usually at the stern.
Sail. A device of canvas and rope fastened to spars and rigging, and extended to catch the wind and drive the vessel.
Skiff. Long, lightly built boat sometimes used in rowing races.
Sloop. Vessel with one mast, having a jib-sail.
Spar. Any shaped piece of timber used as a mast, bowsprit, yard, etc., or intended for such use.
Stanchion. A stationary upright support.
Superstructure. Any structure above top full deck.
Tack. To change the direction of sailing due to wind.
Thwart. Seats are called thwarts when they extend from side to side of a boat, athwart when across.
Tonnage. Entire capacity or cubical contents of a vessel. One ton estimated at 100 cubic English feet.