What is the Navy term for a "wall"?

The Navy term for a "wall" is referred to as a bulkhead. In maritime terminology, bulkheads are vertical partitions or dividing walls within a ship's hull. Their primary purpose is to provide structural integrity, facilitate compartmentalization for safety, and help manage flooding or fire hazards by containing any breaches or damage. Bulkheads also serve to enhance the ship’s stability and strength.

Understanding the context of the other terms helps clarify why bulkhead is the correct choice. The term "deck" refers to the horizontal structure covering a ship's hold, akin to the floor in a building. "Frame" denotes the structural components of a ship's hull that give it shape and support the outer shell, while "overhead" references the ceiling area within a ship, usually situated directly below the deck. Each of these terms plays a vital role in nautical architecture, but only bulkhead specifically denotes the vertical walls used in the division of space on a vessel.