#billiard_ball  ball used in playing billiards
  supertype:  ball  round object that is hit or thrown or kicked in games; "the ball travelled 90 mph on his serve"; "the mayor threw out the first ball"
  subtype:  cue_ball__cueball  the ball that the billiard player or pool player strikes with his cue
  subtype:  object_ball  the billiard ball first struck by the cue ball

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