dissent vs knockback

dissent

noun
  • A violation that arises when disagreement with an official call is expressed in an inappropriate manner such as foul language, rude gestures, or failure to comply. 

  • An act of disagreeing with, or deviating from, the views and opinions of those holding authority. 

  • Disagreement with the ideas, doctrines, decrees, etc. of a political party, government or religion. 

  • A separate opinion filed in a case by judges who disagree with the outcome of the majority of the court in that case 

verb
  • To disagree; to withhold assent. Construed with from (or, formerly, to). 

  • To differ from, especially in opinion, beliefs, etc. 

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 dissent and knockback occurred in a corpus of books? (source: Google Ngram Viewer )