headscarf vs shawl

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. 

shawl

noun
  • A square or rectangular piece of cloth worn as a covering for the head, neck, and shoulders, typically by women. 

  • A fold of wrinkled flesh under the lips and neck of a bloodhound, used in scenting. 

verb
  • To wrap in a shawl. 

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