fluctuate vs hesitate

fluctuate

verb
  • To be irresolute; to waver. 

  • To cause to vary irregularly. 

  • To vary irregularly; to swing. 

  • To undulate. 

hesitate

verb
  • To stammer; to falter in speaking. 

  • To stop or pause respecting decision or action; to be in suspense or uncertainty as to a determination. 

  • To utter with hesitation or to intimate by a reluctant manner. 

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