motivate vs undertake

motivate

verb
  • To provide someone with an incentive to do something; to encourage. 

  • To animate; to propel; to cause to take action 

undertake

verb
  • To commit oneself (to an obligation, activity etc.). 

  • To pass a slower moving vehicle on the curbside rather than on the side closest to oncoming traffic. 

  • To take upon oneself; to start, to embark on (a specific task etc.). 

noun
  • The passing of slower traffic on the curbside rather than on the side closest to oncoming traffic. 

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