cocktail lounge vs nightspot

cocktail lounge

noun
  • A business with seating and, sometimes, entertainment, where alcoholic beverages—especially mixed drinks—may be purchased and consumed. 

nightspot

noun
  • An establishment that is open late at night, especially one that provides entertainment, such as a nightclub. 

How often have the words cocktail lounge and nightspot occurred in a corpus of books? (source: Google Ngram Viewer )