commencement vs pinnacle

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. 

pinnacle

verb
  • To place on a pinnacle. 

  • To build or furnish with a pinnacle or pinnacles. 

noun
  • An upright member, generally ending in a small spire, used to finish a buttress, to constitute a part in a proportion, as where pinnacles flank a gable or spire. 

  • The highest point. 

  • Coordinate term: sea stack 

  • A tall, sharp and craggy rock or mountain. 

  • An all-time high; a point of greatest achievement or success. 

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