Mohammedan vs hajji

Mohammedan

noun

  • Muslim. 

adj

  • Muslim, Islamic. 

  • relating to Mohammed. 

hajji

noun

  • A Muslim or Arab. 

  • a Muslim who has participated in a hajj. 

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