commencement vs finale

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. 

finale

noun
  • The chronological conclusion of a series of narrative works. 

  • The grand end of something, especially a show or piece of music. 

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