occupancy vs terrain

occupancy

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

  • 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. 

terrain

noun
  • An area of land or the particular features of it. 

  • The surface of the earth; the ground. 

  • A single, distinctive rock formation; an area having a preponderance of a particular rock or group of rocks. 

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