eject vs retain

eject

verb
  • To compel (a person or persons) to leave. 

  • To cause (something) to come out of a machine. 

  • To forcefully project oneself or another occupant from an aircraft (or, rarely, another type of vehicle), typically using an ejection seat or escape capsule. 

  • To come out of a machine. 

  • To compel (a sports player) to leave the field because of inappropriate behaviour. 

  • To throw out or remove forcefully. 

noun
  • an inferred object of someone else's consciousness 

retain

verb
  • To keep in possession or use. 

  • 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 hold secure. 

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