Sentence:  I knocked on the vice president's <WSD>door</WSD> 
Meaning of the word marked with <WSD> tags:  A (portal) of entry into a building, room, or vehicle, consisting of a rigid plane movable on a (hinge). Doors are frequently made of (wood) or (metal). May have a (handle) to help open and close, a (latch) to hold the door closed(,) and a (lock) that ensures the door cannot be opened without the key.