saloon vs sentry-box

saloon

noun
  • A tavern, especially in an American Old West setting. 

  • The cabin area of a boat or yacht devoted to seated relaxation, often combined with dining table. 

  • the part of a rail carriage or multiple unit containing seating for passengers. 

  • A barbershop (store offering haircuts). 

  • The most common body style for modern cars, with a boot or trunk. 

sentry-box

noun
  • A booth erected to provide rudimentary shelter to a sentry on his post. 

How often have the words saloon and sentry-box occurred in a corpus of books? (source: Google Ngram Viewer )