king of kings vs reigner

king of kings

noun

  • A king who has other kings as subjects; an emperor. 

name

  • Jesus Christ. 

  • The title of an individual king who has other kings as subjects; in particular 

reigner

noun

  • One who reigns; a ruler. 

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