austereness vs severity

austereness

noun
  • severity; strictness; austerity. 

  • harshness or astringent sourness to the taste; acerbity. 

severity

noun
  • The state of being severe. 

  • The degree of something undesirable; badness or seriousness. 

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