commuter vs dormitory

commuter

noun
  • To and from work and home. 

  • Using public transport. 

  • Normally a short form of commuter rail, commuter train or commuter bus; A transport system or a vehicle in such systems used to transport commuters (#2) 

  • One who commutes (etymology 1). 

dormitory

noun
  • A room containing a number of beds (and often some other furniture and/or utilities) for sleeping, often applied to student and backpacker accommodation of this kind. 

  • A building or part of a building which houses students, soldiers, monks etc. who sleep there and use communal further facilities. 

  • A dormitory town. 

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