executioner vs plugger

executioner

noun
  • A hit man, especially being in some organization. 

  • An official person who carries out the capital punishment of a criminal. 

plugger

noun
  • A thong or flip-flop. 

  • A dental instrument used to insert fillings. 

  • One who, or that which, plugs. 

How often have the words executioner and plugger occurred in a corpus of books? (source: Google Ngram Viewer )