severity vs toleration

severity

noun
  • The degree of something undesirable; badness or seriousness. 

  • The state of being severe. 

toleration

noun
  • The allowance of something not explicitly approved; tolerance, forbearance. 

  • Specifically, the allowance by a government (or other ruling power) of the exercise of religion beyond the state established faith. 

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