pursue vs take on

pursue

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

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

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

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

  • To act as a legal prosecutor. 

take on

verb
  • To assume or take responsibility for. 

  • To (attempt to) dribble round (an opposition player). 

  • To catch on, do well; to become popular. 

  • To obtain the services of (a person) in exchange for remuneration; to give someone a job. 

  • To begin to have or exhibit. 

  • To attempt to fight, compete with, or engage with. 

  • To acquire, bring in, or introduce. 

  • To grieve or be concerned (about something or someone). 

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