#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
  part of:  #bed
  subtype:  #air_mattress  a mattress that can be stored flat and inflated for use
     subtype:  #Lilo  (trademark) a type of inflatable air mattress
  subtype:  #feather_bed__featherbed__featherbed  a mattress stuffed with feathers
  subtype:  #futon  (Japanese) mattress consisting of a pad of cotton batting that is used for sleeping on the floor or on a raised frame
  subtype:  #paillasse__palliasse  mattress consisting of a thin pad filled with straw or sawdust
  subtype:  #pallet  a mattress filled with straw or a pad made of quilts; used as a bed
  subtype:  #spring_mattress  a mattress containing springs in a rigid frame
  subtype:  #tick.mattress  a light mattress

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