burn at the stake vs neutralize

burn at the stake

verb
  • To kill (someone) by tying them to a post and setting a fire beneath them 

neutralize

verb
  • To kill. 

  • To make even, inactive or ineffective. 

  • To make (a territory, etc.) politically neutral. 

  • To make (an acidic or alkaline substance) chemically neutral. 

How often have the words burn at the stake and neutralize occurred in a corpus of books? (source: Google Ngram Viewer )