abdicate vs retain

abdicate

verb
  • To relinquish or renounce a throne, or other high office or dignity; to renounce sovereignty. 

  • To surrender, renounce or relinquish, as sovereign power; to withdraw definitely from filling or exercising, as a high office, station, dignity; to fail to fulfill responsibility for. 

retain

verb
  • To employ by paying a retainer. 

  • To hold back (a pupil) instead of allowing them to advance to the next class or year. 

  • To keep in one's pay or service. 

  • To keep in possession or use. 

  • To hold secure. 

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