#mattress  a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed
  supertype:  pad  a usually thin flat mass of padding
  subtype:  air_mattress  feather_bed  futon  paillasse  pallet  spring_mattress  tick.mattress
  part of:  bed  a piece of furniture that provides a place to sleep; "he sat on the edge of the bed"; "the room had only a bed and chair"

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