Romani vs didicoi

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. 

didicoi

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