campfire vs campground

campfire

noun
  • A fire at a campground or on a camping trip, often used for cooking, to provide light and heat, to drive away bugs, and as a focal point for sitting around in the evening and talking, telling stories, and singing. 

campground

noun
  • An area where a camp meeting (a retreat) is held. 

  • An area where tents are pitched. 

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