boarding house vs dormitory

boarding house

noun
  • A boarding school building where boarders live during term time. 

  • A private house in which paying residents are provided with accommodation and meals. 

dormitory

noun
  • A dormitory town. 

  • 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. 

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