The fourth deck of a ship is typically referred to as the "lower deck." Depending on the ship's design and purpose, this deck may be used for various functions, including crew accommodations, storage, or machinery spaces. In some contexts, especially on naval ships, it might also be referred to as the "orlop deck," which is the lowest deck that typically contains storage for cables and other equipment.
The open deck of a ship is called the weather deck.
Deck Flamouse
Below deck
The top deck name is contingent on the type of ship or vessel. The top deck on a cruise ship is usually called the Lido deck. The top deck on a battle ship is sometimes referred to as topside or poop deck. The poop deck got its name from the amount of birds flying overhead.
a deck...
deck
deck
* Orlop deck: The deck or part of a deck where the cables are stowed, usually below the water line. It is the lowest deck in a ship.
the deck on a ship is like a floor like 1st 2nd 3rd
Mast
Mast
Each level is called a "deck".