Saracen vs raghead

Saracen

noun
  • A type of six-wheeled armoured personnel carrier. 

  • 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. 

raghead

noun
  • A Muslim, Arab, Hindu, Sikh, Indian or member of any group that traditionally wears a headdress such as a turban, keffiyeh or headscarf. 

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