haunt vs undertake

haunt

verb
  • To practise; to devote oneself to. 

  • To stalk; to follow. 

  • To accustom; habituate; make accustomed to. 

  • To inhabit or to visit frequently (most often used in reference to ghosts). 

  • To make uneasy, restless. 

  • To persist in staying or visiting. 

noun
  • A place at which one is regularly found; a habitation or hangout. 

  • A ghost. 

  • A lair or feeding place of animals. 

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 haunt and undertake occurred in a corpus of books? (source: Google Ngram Viewer )