#appurtenance__accessory__supplement  a supplementary component
  supertype:  #component__constituent  an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system: "spare components for cars"; "a component or constituent element of a system"
  subtype:  #auto_accessory  an accessory for an automobile
  subtype:  #computer_accessory  an accessory for a computer
  subtype:  #cut-in__cutin__insert  (film) a still inserted and interrupting the action; (broadcasting) a local announcement inserted into a network broadcast
  subtype:  #fitting  a small and often standardized accessory to a larger system
     subtype:  #gas_fitting__gasfitting  the fitting (pipes or valves or meters) that convey gas from the gas main to the gas fixtures of a building
     subtype:  #pipefitting__pipe_fitting  fitting consisting of threaded pieces of pipe for joining pipes together
        subtype:  #reducer  pipefitting that joins two pipes of different diameter
     subtype:  #receptacle.fitting  an electrical (or electronic) fitting that is connected to a source of power and equipped to receive an insert
        subtype:  #outlet_box  (electricity) receptacle consisting of the metal box designed for connections to a wiring system
        subtype:  #expansion_slot__expansionslot__slot  (computers) a socket in a microcomputer that will accept a plug-in circuit board
        subtype:  #socket  a receptacle into which an electric device can be inserted
           subtype:  #electric_socket  a socket into which a lightbulb can be inserted
        subtype:  #wall_socket__wall_plug__electric_outlet__electrical_outlet__outlet__electric_receptacle  receptacle providing a place in a wiring system where current can be taken to run electrical devices
           subtype:  #power_point__powerpoint__point  (British) a wall socket

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