boarding house vs inn

boarding house

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

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

inn

noun
  • Any establishment where travellers can procure lodging, food, and drink. 

  • A tavern. 

  • One of the colleges (societies or buildings) in London, for students of the law barristers. 

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