happy hour vs stillness

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. 

stillness

noun
  • Habitual silence or quiet; taciturnity. 

  • The quality or state of being still. 

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