anyone know navy ship nomenclature?

Widest part is the beam.

The bottom is called the keel.

The back is called the stern.

The pointy bit at the front is called the stem (or bows).

The part that sits below the waterline is called the draft.

The part that sits above the waterline is called the freeboard.

The total height of the hull (without superstructure) is called the depth.

The centreline is called amidships.

The raised deck at the front is called the forecastle.

The raised deck at the rear is called the poop deck (yup, for real!!)

Main deck is the top most deck at the top of the hull. All levels above this are numbered, 01, 02, 03, etc. All levels below this are numbered 1st, second, third, etc.

The beam is the widest part of the ship.

The hull is the area between the keel, the bottom of the ship, and the main deck at the top of the hull.

Most naval vessels have multiple decks between the main deck and the keel, so that question isn't valid.

Something behind? Behind what? A towed array is towed behind a ship.

The Bow is at the front, and the Stern is at the rear.

that is in accordance with plane agencies. the colourful uniforms used onboard plane agencies on the time to designate the occupation of the wearer additionally stimulated action picture star Trek's "uniforms" of yellow for adminstrators, blue for technology team and crimson for engineering and protection.