denier vs knockback

denier

noun
  • One who denies or forbids something. 

  • One who denies the existence of 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. 

knockback

noun
  • A rejection; a refusal. 

  • A blow that causes the recipient to fall or move backwards, a knock back; a recoil. 

  • Something that impedes or reverses progress; a setback. 

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