Romani vs Traveler

Romani

noun
  • A member of the Roma, a nomadic people with origins in India. 

adj
  • Of or belonging to the Roma people. 

name
  • The Indo-Aryan lect of the Roma people, or one of its sublects (such as Roma, Sinti, Romanichal, etc), closely related to Hindi and Rajasthani. 

Traveler

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