intolerance vs racial discrimination

intolerance

noun
  • The state of being intolerant. 

  • An intolerant word or action. 

  • Extreme sensitivity to a food or drug; allergy. 

racial discrimination

noun
  • Discrimination on grounds of race or ethnicity. 

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