organizer

organizer
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1 someone whose task is to see that work goes harmoniously.
2 a desk used for writing.
3 a secretary having administrative duties and responsibilities.
Japanese says kan-ji.

chief

chief
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1 the leader of a group of people. 2 the head of a tribe or clan. 3 the head administrative officer of a college or university.
Japanese says shu-seki.

challenger

challenger
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the contestant you hope to defeat
Japanese says cyo-sen-sha

hunter

hunter
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someone who hunts game
Japanese says karyu-do.