inertia vs occupation

inertia

noun
  • Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased. 

  • In a person, unwillingness to take action. 

  • The property of a body that resists any change to its uniform motion; equivalent to its mass. 

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 inertia and occupation occurred in a corpus of books? (source: Google Ngram Viewer )