#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"
  part:  landing.platform  stairhead  stair
  part of:  edifice
  subtype:  backstairs  a second staircase at the rear of a building
  subtype:  companionway  a stairway or ladder that leads from one deck to another on a ship
  subtype:  escalator__movingstaircase__moving_stairway  a stairway whose steps move continuously on a circulating belt
  subtype:  fire_escape__emergency_exit__emergencyexit  a stairway (often on the outside of a building) that permits emergency exit in the case of fire
  subtype:  flight_of_stairs__flight__flight_of_steps  a stairway (set of steps) between one floor or landing and the next
  subtype:  ghat  stairway in India leading down to a landing on the water
  subtype:  ladder  steps consisting of two parallel members connected by rungs; for climbing up or down
     subtype:  extension_ladder__extensionladder  a ladder whose length can be extended
        subtype:  aerial_ladder  mechanically extendible ladder; used on a fire truck
     subtype:  jack_ladder__Jacob's_ladder__pilot_ladder__pilotladder  (nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps
     subtype:  monkey_ladder  a light ladder to the monkey bridge on a ship
     subtype:  rope_ladder  a ladder with side pieces of rope
     subtype:  scaling_ladder__scalingladder  a ladder used to scale the walls in an attack
     subtype:  sea_ladder__sealadder__sea_steps__seastep  (nautical) ladder to be lowered over a ship's side for coming aboard
        subtype:  accommodation_ladder__accommodationladder  (nautical) a portable ladder hung over the side of a vessel to give access to small boats alongside
     subtype:  step_ladder__stepladder  a folding portable ladder hinged at the top

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