autarchy vs invincibility

autarchy

noun
  • A condition of absolute power. 

  • Autocracy (absolute rule by a single person). 

  • Sovereignty or self-government (national political independence). 

invincibility

noun
  • The quality or state of being invincible; invincibleness. 

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