#closure__block__occlusion__stop__stoppage  an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"
  supertype:  #obstructor__obstruction__obstructer__impediment__impedimenta  any structure that makes progress difficult
  subtype:  #breechblock__breech_closer  a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
  subtype:  #plug__stopper__stopple  blockage consisting of an object designed to fill a hole tightly
     subtype:  #bung__spile  a plug used to close a hole in a barrel or flask
     subtype:  #cork.plug  the plug in the mouth of a bottle (especially a wine bottle)
     subtype:  #drainplug  a removable plug for holding water in a tub or basin
     subtype:  #fipple  a wooden plug forming a flue pipe (as the mouthpiece of a recorder)
     subtype:  #tampion  plug for the muzzle of a gun to keep out dust and moisture
     subtype:  #tampon  plug of cotton or other absorbent material; inserted into wound or body cavity to absorb exuded fluids (especially blood)
        subtype:  #Tampax  (trade name) tampon used to absorb menstrual flow
     subtype:  #spigot__tap  a plug for a bunghole in a cask
  subtype:  #vapor_lock__vaporlock__vapourlock  a stoppage in a pipeline caused by gas bubbles (especially a stoppage that develops in hot weather in an internal-combustion engine when fuel in the gas line boils and forms bubbles that block the flow of gasoline to the carburetor)

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