enlighten vs overwhelm

enlighten

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

  • To supply with light. 

overwhelm

noun
  • The state or condition of being overwhelmed. 

verb
  • To overpower emotionally. 

  • To cause to surround, to cover. 

  • To engulf, surge over and submerge. 

  • To overpower, crush. 

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