What term is used for the walls of a ship?

The term used for the walls of a ship is "bulkhead." Bulkheads are vertical partitions that divide a ship's interior into separate compartments, contributing to the structural integrity and safety of the vessel. They help to contain flooding in case of an emergency, enhance stability, and provide clear separation between different areas of the ship, such as crew quarters, cargo holds, and machinery spaces.

In contrast, the hull refers to the main body of the ship that sits in the water, the deck refers to the horizontal surfaces where crew and cargo can be placed or moved, and the cabin typically refers to enclosed living spaces for the crew or passengers. While all these terms are related to different aspects of a ship's structure, it is the bulkhead that specifically designates the walls within the vessel.