#cap.protective_cover  something serving as a cover or protection
  supertype:  protective_cover__protective_covering__protection  a covering that is intend to protect from damage or injury; "they had no protection from the fallout"; "wax provided protection for the floors"
  subtype:  distributor_cap__distributorcap  the cap of the distributor that holds in place the wires from the distributor to the spark plugs
  subtype:  ferrule__collet  a metal cap or band placed on a wooden pole to prevent splitting
  subtype:  hubcap  cap that fits over the hub of a wheel
  subtype:  lens_cap__lens_cover  cap used to keep lens free of dust when not in use
  subtype:  thimble  a small metal cap to protect the finger while sewing; can be used as a small container

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