A submarine is a sea-going vessel, both on the surface and under the water.
The vessel is a submarine.
In general, yes, a submarine is larger than a submersible. A submersible is usually considered to be a small craft operated from a support vessel.
submarine
A vessel that travels underwater is termed a submarine.
Submarine.
submarine
A submarine is a vessel that can travel both on the surface and under the water.
"Yellow Submarine"
The correct spelling is submarine (underwater, or a submersible vessel).
A submarine
The rathskeller vessel is the famous German u-boat submarine as the Americans called it that sunk various allied ships.
The term "Stern" is the Navy term for the aft (rear) section of any ship or submarine, generally referring to the rearmost portion of the vessel.