necrotic vs septic

necrotic

adj
  • Of or pertaining to necrosis, particularly of tissue. 

septic

adj
  • Of or pertaining to sepsis. 

  • Of or pertaining to sewage or the disposal of sewage. 

  • Of the seventh degree or order. 

  • Causing sepsis or putrefaction. 

noun
  • A mathematical object (function, curve, surface, etc.) of degree seven. 

  • An American, a Yank. 

  • A substance that causes sepsis or putrefaction. 

  • A septic tank; a system for the disposal of sewage into a septic tank, a septic system. 

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