legitimacy vs unfairness

legitimacy

noun
  • The quality or state of being legitimate or valid; validity. 

  • Lawfulness of birth or origin; directness of descent as affecting the royal succession. 

unfairness

noun
  • An unjust act or situation. 

  • The state of being unfair; lack of justice. 

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