rationale vs vindication

rationale

noun
  • A justification or rationalization for something. 

  • An explanation of the basis or fundamental reasons for something. 

  • A liturgical vestment worn by some Christian bishops of various denominations. 

vindication

noun
  • Evidence, facts, statements, or arguments that justify a claim or belief. 

  • The act of vindicating or the state of being vindicated. 

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