headscarf vs yashmak

headscarf

noun
  • A more or less square piece of material worn over the head, typically by women, often to protect the hair, or for religious reasons. 

yashmak

noun
  • A veil worn by Muslim women to cover parts of the face when they are in public. 

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