In a certain code language, if wall is called door, door is called window, window is called roof, roof is called ventilator and ventilator is called floor, then what makes a way to a room?

window

 if wall is called door,

door is called window

window is called roof

roof is called ventilator 

ventilator is called floor

what makes a way to a room

THE LOGIC FOLLOWED HERE IS  :

WAY TO ROOM IS CALLED DOOR

AND DOOR IS CALLED WINDOW