daily grind vs vocation

daily grind

noun
  • The difficult, routine, or monotonous tasks of daily work. 

vocation

noun
  • An occupation for which a person is suited, trained or qualified. 

  • An inclination to undertake a certain kind of work, especially a religious career; often in response to a perceived summons; a calling. 

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