hegemony vs overlordship

hegemony

noun
  • Domination, influence, or authority over another, especially by one political group over a society or by one nation over others. 

  • Dominance of one social group over another, such that the ruling group or hegemon acquires some degree of consent from the subordinate, as opposed to dominance purely by force. 

overlordship

noun
  • The realm of overlords. 

  • The position or quality of being an overlord. 

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