retain vs terminate

retain

verb
  • To keep in one's pay or service. 

  • 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 possession or use. 

  • To hold secure. 

terminate

verb
  • To end the employment contract of an employee; to fire, lay off. 

  • Of a mode of transport, to end its journey; or, of a railway line, to reach its terminus. 

  • To conclude. 

  • To end, conclude, or cease; to come to an end. 

  • To set or be a limit or boundary to. 

  • To kill someone or something. 

  • To issue or result. 

  • To end something, especially when left in an incomplete state. 

adj
  • Having a definite and clear limit or boundary; having a determinate size, shape or magnitude. 

  • Terminated; limited; bounded; ended. 

  • Expressible in a finite number of terms; (of a decimal) not recurring or infinite. 

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