knockback vs proscription

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. 

proscription

noun
  • A decree or law that prohibits. 

  • Decree of condemnation toward one or more persons, especially in the Roman antiquity. 

  • A prohibition. 

  • The act of proscribing, or its result. 

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