bannock vs tortilla

bannock

noun
  • An unleavened bread made with barley, wheat, or oatmeal. 

  • A biscuit bread made of wheat flour or cornmeal, fat, and sometimes baking powder, typically baked over a fire, wrapped around a stick or in a pan. 

tortilla

noun
  • A flat round bread made out of cornmeal or flour. 

  • Spanish omelette; an omelette containing potatoes and onions. 

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