occupancy vs roost

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. 

roost

noun
  • The inner roof of a cottage. 

  • A group of birds roosting together. 

  • A tidal race. 

  • A bedroom 

  • The place where a bird sleeps (usually its nest or a branch). 

verb
  • to spend the night 

  • To settle on a perch in order to sleep or rest 

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