executioner vs whipper

executioner

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

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

whipper

noun
  • A person or thing that whips. 

  • A device that whips a substance, such as cream. 

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