interdiction vs knockback

interdiction

noun
  • the act of interdicting or something interdicted 

  • the destruction of an enemy's military potential before it can be used 

knockback

noun
  • Something that impedes or reverses progress; a setback. 

  • A rejection; a refusal. 

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

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