enact vs enforce

enact

verb
  • to do; to effect 

  • to act the part of; to play 

  • to make (a bill) into law 

enforce

verb
  • To give strength or force to; to affirm, to emphasize. 

  • To keep up, impose or bring into effect something, not necessarily by force. 

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