boarding house vs tenement

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. 

tenement

noun
  • A building that is rented to multiple tenants, especially a low-rent, run-down one. 

  • Dwelling; abode; habitation. 

  • Any form of property that is held by one person from another, rather than being owned. 

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