fester vs gangrene

fester

verb
  • To become septic; to become rotten. 

  • To worsen, especially due to lack of attention. 

  • To cause to fester or rankle. 

noun
  • The condition of something that festers; a festering; a festerment. 

  • A sore or an ulcer of the skin. 

gangrene

verb
  • To corrupt; To cause to become degenerate. 

  • To produce gangrene in. 

  • To be affected with gangrene. 

noun
  • The necrosis or rotting of flesh, usually caused by lack of blood supply. 

  • A damaging or corrupting influence. 

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