Deck is ambiguous, doesn't have wiki page and is currently used for piers (post #4067653) porches (post #4858178), ship decks (post #4271409), card decks/deck of cards (post #2451839) and flight decks (post #3225495)
Should it be deprecated and the others get aliases like deck_(ship) -> ship deck, deck_(cards) -> deck of cards so people can find/use them. There's also the smaller wooden deck tag which is mostly porches and ship decks.