hash house vs inn

hash house

noun
  • A cheap restaurant. 

  • In the sport of rogaining, a central base camp providing hot meals and a place to sleep. 

inn

noun
  • A tavern. 

  • One of the colleges (societies or buildings) in London, for students of the law barristers. 

  • Any establishment where travellers can procure lodging, food, and drink. 

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