#bathtub__bathing_tub__bathingtub__bath__tub  a relatively large open container that you fill with water and use to wash the body
  supertype:  vessel  an object used as a container (especially for liquids)
  subtype:  footbath  hot_tub  Jacuzzi  sitz_bath
  part of:  bathroom__bath  a room (as in a residence) containing a bath or shower and usually a washbasin and toilet
     part of:  dwelling_house__dwelling__home__domicile__abode__habitation  housing that someone is living in; "he built a modest dwelling near the pond"; "they raise money to provide homes for the homeless"

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