A boat is a watercraft of a large range of type and size.
The bow is the forward part of the hull of a ship or boat, the point that is usually most forward when the vessel is underway.
An impeller (also written as impellor or impellar) is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid.
Port and starboard are nautical and aeronautical terms for left and right, respectively.
A propeller is a type of fan that transmits power by converting rotational motion into thrust.
A reaction control system (RCS) is a spacecraft system that uses thrusters to provide attitude control, and sometimes translation.
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying passengers or goods, or in support of specialized missions, such as defense, research and fishing.
A tug (tugboat or towboat) is a type of vessel that maneuvers other vessels by pushing or pulling them either by direct contact or by means of a tow line.
The waterline is the line where the hull of a ship meets the surface of the water.