prefect vs warlord

prefect

noun
  • A commander. 

  • The head of a department in France. 

  • A school pupil in a position of power over other pupils. 

  • An official of Ancient Rome who controlled or superintended a particular command, charge, department, etc. 

  • The head of a county in Albania or Romania. 

  • The head of a prefecture in Japan. 

warlord

noun
  • A high military officer in a warlike nation. 

  • A local ruler or bandit leader usually where the government is weak. 

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