commencement vs quietus

commencement

noun
  • The first existence of anything; act or fact of commencing; the beginning. 

  • The day when degrees are conferred by colleges and universities upon students and others. 

  • A graduation ceremony, from a school, college or university. 

quietus

noun
  • Death. 

  • Final settlement (e.g., of a debt). 

  • A stillness or pause; something that quiets or represses; removal from activity. 

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