We also have a "Monkey Island" deck, "Promenade" decks, an Orlop deck, a deck that's called a "Flat" (as in where the steering gear is), a Bridge deck that isn't a bridge, a Fiddley deck that doesn't fiddle or is even a proper deck, Flight decks that can't fly. Chain lockers that are in no way "lockers", a "tonnage" hatch that's the exact opposite of its literal meaning. I could go on, but what's the point. Nautical language (expletives excepted) is a language of its own.
Wher else can you find a ceiling that can be a vertical wall or something to walk on? Or floors that are always vertical? Where "proper" ceilings are called deckheads when they should be called deckunders? Enough! BY.