What is a cook called on a merchant ship?

A chief cook (often shortened to cook) is a seniormost unlicensed crewmember working in the steward's department of a merchant ship.

The chief cook directs and participates in the preparation and serving of meals; determines timing and sequence of operations required to meet serving times; inspects galley and equipment for cleanliness; and oversees proper storage and preparation of food. The cook may plan or assist in planning meals and taking inventory of stores and equipment.

A chief cook's duties may overlap with those of the steward's assistant, the chief steward, and other steward's department crewmembers.