inn vs singles bar

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. 

singles bar

noun
  • A bar or similar establishment for unattached people to meet. 

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