#stairway__staircase__stairs__steps__step  a way of access consisting of a set of steps
  supertype:  way  any artifact consisting of a road or path affording passage from one place to another; "he said he was looking for the way out"
  subtype:  backstairs  companionway  escalator  fire_escape  flight_of_stairs  ghat  ladder
  part:  landing.platform  stairhead  stair
  part of:  edifice__building  a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"

No statement uses or specializes stairway; click here to add one.