enact vs nullify

enact

verb
  • to make (a bill) into law 

  • to do; to effect 

  • to act the part of; to play 

nullify

verb
  • To make legally invalid. 

  • To prevent from happening. 

  • To make of no use or value; to cancel out. 

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