fulfill vs undo

fulfill

verb
  • To satisfy, carry out, bring to completion (an obligation, a requirement, etc.). 

  • To emotionally or artistically satisfy; to develop one's gifts to the fullest. 

  • To package, distribute, or ship goods. 

  • To obey, follow, comply with (a rule, requirement etc.). 

undo

verb
  • To unfasten. 

  • To reverse the effects of an action. 

  • To impoverish or ruin, as in reputation; to cause the downfall of. 

noun
  • An operation that reverses a previous action. 

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