What is the name of a stout round pole as a ship's mast called?

A stout round pole used as a ship's mast is called a "mast." It serves as the vertical structure to support sails and rigging, playing a crucial role in the vessel's navigation and propulsion. Depending on its height and function, masts can be categorized into different types, such as main mast, fore mast, and mizzen mast.