affirmation vs rebuttal

affirmation

noun
  • That which is affirmed; a declaration that something is true. 

  • A form of self-forced meditation or repetition; autosuggestion. 

  • The solemn declaration made by Quakers and others incapable of taking an oath. 

rebuttal

noun
  • The act of contradicting something by making a contrary argument, or presenting contrary evidence. 

  • A statement, designed to refute or negate specific arguments put forward by opponents. 

  • A pleading by a defendant in reply to the evidence put forward by a plaintiff or the prosecution. 

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