copybook vs quintessential

copybook

noun
  • A series of instructions or data definitions copied into multiple programs from a shared library; boilerplate. 

  • A student's exercise book containing samples of good handwriting to be copied. 

  • A notebook containing blank, often lined, pages for writing answers. 

quintessential

adj
  • Of the nature of a quintessence (in all senses); being or relating to the ultimate essence of something. 

noun
  • The fundamental essence of something. 

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