dominion vs regnum

dominion

noun
  • predominance; ascendancy 

  • A kingdom, nation, or other sphere of influence; governed territory. 

  • Power or the use of power; sovereignty over something; stewardship, supremacy. 

  • kingdom 

  • An order of angel in Christian angelology, ranked above virtues and below thrones. 

regnum

noun
  • A rank in the classification of organisms, below dominium and above divisio. 

  • A badge of royalty, especially the early form of the pope's tiara. 

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