coffee shop vs sentry-box

coffee shop

noun
  • A café-like establishment selling marijuana in the Netherlands. 

  • A small café or restaurant typically selling light refreshments along with coffee-based drinks. 

  • Used other than figuratively or idiomatically: see coffee, shop. 

sentry-box

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

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