box office vs opera house

box office

noun
  • A place where tickets are sold in a theatre/theater or cinema. 

  • The total amount of money paid by people worldwide to watch a movie at cinemas/movie theaters. 

  • Quality of an entertainment or spectacle that makes it very popular with the public, or likely to be so. 

opera house

noun
  • A theatre, or similar building, primarily used for staging opera. 

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