crown princess vs rajah

crown princess

noun
  • The wife of a crown prince. 

  • The heiress apparent to the throne in a royal or imperial monarchy. 

rajah

noun
  • a Hindu prince or ruler in India. 

  • Any of various nymphalid butterflies of the genus Charaxes. 

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