happy hour vs interruption

happy hour

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

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

  • Flowers. 

interruption

noun
  • The act of interrupting, or the state of being interrupted. 

  • A time interval during which there is a cessation of something. 

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