tortilla vs tostada

tortilla

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

  • Spanish omelette; an omelette containing potatoes and onions. 

tostada

noun
  • A bowl-shaped tortilla that has been fried and filled with various ingredients. 

  • A flat tortilla that has been fried or toasted, or a dish based on this. Usually associated with the cuisine of Latin America. 

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