Muslim vs iman

Muslim

noun

  • A person who is a follower and believer of Islam. 

adj

  • Being or relating to a believer of Islam. 

iman

noun

  • Pious adherence to the Islamic faith. 

  • A believer in the Islamic faith. 

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