dough vs naan

dough

noun
  • A thick, malleable substance made by mixing flour with other ingredients such as water, eggs, and/or butter, that is made into a particular form and then baked. 

verb
  • To make into dough. 

naan

noun
  • A type of round, flat bread baked in a tandoor popular in South and Central Asian cuisine. 

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