practise vs undertake

practise

verb
  • To put into practice; to carry out; to act upon; to commit; to execute; to do. 

  • To make use of; to employ. 

  • To teach or accustom by practice; to train. 

  • To repeat (an activity) as a way of improving one's skill in that activity. 

  • To perform or observe in a habitual fashion. 

  • To pursue (a career, especially law, fine art or medicine). 

  • To repeat an activity in this way. 

undertake

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

  • 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. 

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

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