cookout vs hibachi

cookout

noun
  • A gathering for a meal that is cooked and eaten outside; either a domestic barbecue or a larger social event. 

hibachi

noun
  • A cooking method and performance art in which the chef grills pieces of food on a hot metal griddle in front of the guests; teppanyaki. This terminology is virtually unknown in Japan. 

  • The griddle used in such cuisine; teppan. 

  • A portable brazier, powered by charcoal, used for cooking. 

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