hajji vs pilgrim

hajji

noun
  • A Muslim or Arab. 

  • a Muslim who has participated in a hajj. 

pilgrim

noun
  • One who travels, especially on a journey to visit sites of religious significance. 

  • A newcomer. 

  • A silk screen formerly attached to the back of a woman's bonnet to protect the neck. 

verb
  • To journey; to wander; to ramble. 

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