Door: the large flat piece of wood, glass etc that you move when you go into or out to a building, room vehicle etc, or when you open a cup board gate.
window: a space or an area of glass in the wall of a building or vehicle that lets in light.
stair: a set of steps built for going from one level of a building to another.
wall: an upright flat structure made of stone or brick that divides one area from another or surround an area fence.
floor: the flat surface that you stand on inside a building.
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