hijab vs shemagh

hijab

noun
  • A traditional headscarf worn by Muslim women, covering the hair and neck. 

  • The practice, among Muslim women, of covering the body after the age of puberty in front of non-related adult males. 

shemagh

noun
  • A headcloth designed for a desert environment to protect the wearer from sand and heat. 

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