occupancy vs occupation

occupancy

noun
  • The act of occupying, the state of being occupied or the state of being an occupant or tenant. 

  • The specific use to which something occupied is put. 

  • The period of time during which someone rents or otherwise occupies certain land or premises. 

occupation

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

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

  • 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. 

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