need vs occupancy

need

noun
  • Lack of means of subsistence; poverty; indigence; destitution. 

  • A requirement for something; something needed. 

verb
  • To be obliged or required (to do something). 

  • To be required; to be necessary. 

  • To want strongly; to feel that one must have something. 

  • To have an absolute requirement for. 

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. 

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