pita vs pita bread

pita

noun
  • A flat bread pouch used for making sandwiches such as gyros or falafels. 

  • The plant which yields the fiber. 

  • A fiber obtained from the Agave americana and related species, used for making cordage and paper. 

pita bread

noun
  • Pita; pocket bread. 

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