happy hour vs interlude

happy hour

noun
  • A time of day, usually in the afternoon or early evening, when a bar or pub offers its drinks at a discounted price. 

  • Any small gathering, usually in the afternoon or early evening, set aside to relax and have a drink. 

  • Flowers. 

interlude

noun
  • An intervening episode, etc. 

  • An entertainment between the acts of a play. 

  • A short piece put between the parts of a longer composition. 

verb
  • To provide with an interlude. 

How often have the words happy hour and interlude occurred in a corpus of books? (source: Google Ngram Viewer )