Gross Tonnage (GT) refers to the volume of all ship's enclosed spaces (from keel to funnel) measured to the outside of the hull framing.
Net tonnage (NT) is based on a calculation of the volume of all cargo spaces of the ship. It indicates a vessel's earning space and is a function of the moulded volume of all cargo spaces of the ship.
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HMSmeans her majesty's ship.
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The scuttle is a hatchway between decks of a ship - when you scuttle a ship you deliberately allow it to fill with water and sink by opening these hatches (or by making hatches yourself with an axe).
Where & when the keel was laid down; meaning when they started building the bottom of the ship (the keel is the bottom of the ship). Like a person's spine and ribs, a ship is the same way, only made of metal instead of bone.
The US had about fifteen battleships during WWII. Your question does not specify which one you mean.