What are small openings on a vessel referred to as?

Small openings on a vessel are referred to as scuttles. Scuttles are typically circular or oval-shaped openings that provide access to the interior of a ship or allow for ventilation. They are often used for various purposes, such as providing light and air to compartments, allowing for the passage of small items, or facilitating inspection and maintenance of different areas of the vessel.

Hatches, in contrast, are larger openings used for access to cargo holds or other sections of a vessel. Bulkheads are walls or partitions within the ship that divide different compartments for structural integrity and safety reasons. Transoms refer to a specific structural element at the stern of a vessel, which provides support and holds the shape of the hull. Each term has a distinct definition and function in the context of vessel construction and operation.