boarding house vs rooming house

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. 

rooming house

noun
  • A house which lets out furnished apartments. 

  • A building with small, basic, inexpensive apartments for rent, often without en-suite bathrooms. 

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