Ishmaelite vs Saracen

Ishmaelite

noun
  • An Arab Muslim. 

  • An outcast. 

  • Any descendant of Ishmael. 

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. 

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