vacancy

An unoccupied position or job.

Whenever there is a vacancy in the office of the Vice President, the President shall nominate a Vice President who shall take office upon confirmation by a majority vote of both Houses of Congress.

An available room in a hotel; guest house, etc.

Empty space.

Sky was set above earth, land ringed with sea, / Chaos retired to its own vacancy ….

A blank mind, unoccupied with thought.

...—who has not looked back to the past with that passion of hopelessness, which deems that life can never more be what it has been,—with a consciousness that the dearer emotions are exhausted, while in their place have arisen but vacancy and weariness?

Lack of intelligence or understanding.