employ vs vocation

employ

noun
  • The state of being an employee; employment. 

verb
  • To hire (somebody for work or a job). 

  • To use (somebody for a job, or something for a task). 

  • To make busy. 

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 employ and vocation occurred in a corpus of books? (source: Google Ngram Viewer )