Saracen vs towelhead

Saracen

noun
  • A member of a nomadic people from the Sinai near the Roman province of Arabia in the early centuries CE, who were specifically distinct from Arabs. 

  • A type of six-wheeled armoured personnel carrier. 

towelhead

noun
  • A member of the Muslims, Arabs, Sikhs, and other groups that traditionally wear headdress such as a turban and keffiyeh or headscarf. 

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