decker

noun
  1. 1

    One who, or that which, decks or adorns; a coverer.

    โ€œa table deckerโ€

  2. 2

    (used in conjunction with a number) Something having numerous levels.

    โ€œWe traveled in a double-decker bus.โ€

Source: https://en.wiktionary.org/wiki/decker