denier vs negationist

denier

noun
  • One who denies the existence of something. 

  • One who denies or forbids something. 

  • An old French coin worth one-twelfth of a sou. 

  • A unit of linear density which indicates the fineness of fiber or yarn, equal to one gram per 9000 meters, used especially to measure or indicate the fineness of hosiery. Originally equal to the weight of a denier coin per 9600 aunes. 

negationist

noun
  • One who revises history in order to omit something that actually happened. 

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