headdress vs hijab

headdress

noun
  • A decorative covering or ornament worn on the head. 

  • A hairdo. 

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. 

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