Saracen vs mu'min

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. 

mu'min

noun
  • A believer in Islam. 

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