enlighten vs prepare

enlighten

verb
  • To make something clear to (someone); to give knowledge or understanding to. 

  • To supply with light. 

prepare

verb
  • To make oneself ready; to get ready, make preparation. 

  • To make ready for a specific future purpose; to set up; to assemble or equip. 

  • To produce or make by combining elements; to synthesize, compound. 

  • To make ready for eating or drinking; to cook. 

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