employ vs occupation

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. 

occupation

noun
  • An activity or task with which one occupies oneself; usually specifically the productive activity, service, trade, or craft for which one is regularly paid; a job. 

  • The act, process or state of possessing a place. 

  • The control of a country or region by a hostile military and/or paramilitary force. 

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