Gwaithor was a Sindarin title for a Captain or Leader of Troops or the head of a guild.It was possibly equivalent to that of a Hothron or Hesto although the title "Gwaithor" implied a large group while "Hothron" tended towards a smaller number.
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A Gwaithor or Hothron most probably referred to an officer who led a company of 80-150 men, though it may also have referred to a higher ranking officer more close to a modern a marshal, general or Colonel.