different between killboard vs millboard

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kill +? board

killboard (plural killboards)

(video games) A table that ranks players by number of kills.
- 2014, Harald Warmelink, Online Gaming and Playful Organization (page 108)
  The killboard system also offered an indicator of the expertise and trust hierarchy. A member who was active in the combat team would keep statistics of combat he or she was involved with on the killboard […]

mill +? board

millboard (countable and uncountable, plural millboards)

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