What is the correct term for a bed on a ship?

The term "bunk" or "rack" is used to refer to a bed on a ship because it accurately describes the sleeping arrangements commonly found in naval vessels. In naval terminology, a "bunk" refers to a platform bed typically arranged in tiers, allowing for efficient use of space in the ship's sleeping quarters. Additionally, the term "rack" specifically denotes the structure that holds the mattress and serves similar functionality as a bunk.

The other terms do not pertain to the context of sleeping arrangements on a ship. "Chit" generally refers to a small slip of paper or note rather than a place to sleep. "Buoy" describes a floating device used for marking navigational channels or mooring rather than a sleeping area. "Barracks" refers to a building for housing naval personnel but typically applies to shore facilities. Therefore, "bunk or rack" is the most accurate and contextually appropriate term for a bed on a ship.