overking vs rajadhiraja

overking

noun
  • A king who has sovereignty over inferior kings or ruling princes; a ruler of an overkingdom; a king that is truly superior or supreme. 

rajadhiraja

noun
  • A prestigious royal ruler in South and Southeast Asia. 

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