Respectively, the front and back of the ship; together they refer to the entire ship

Anything that runs from the bow to the stern or vice versa. Something in line with the centreline of a vessel.

used of anything fixed longitudinally between bow and stern.

Expressions Fore castle Parts

The direction on a vessel parallel to the center line.

Front and back of the vessel, refers to the entire vessel.

Running along the length of the boat.