grill room vs hibachi

grill room

noun
  • A restaurant that specializes in grilled food, where often the food can be seen being prepared by the chefs. 

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 grill room and hibachi occurred in a corpus of books? (source: Google Ngram Viewer )