pursue vs refrain

pursue

verb
  • To follow urgently, originally with intent to capture or harm; to chase. 

  • To follow, travel down (a particular way, course of action etc.). 

  • To aim for, go after (a specified objective, situation etc.). 

  • To participate in (an activity, business etc.); to practise, follow (a profession). 

  • To act as a legal prosecutor. 

refrain

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

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