putrefy vs sphacelate

putrefy

verb
  • To become gangrenous. 

  • To make morbid, carious, or gangrenous. 

  • To corrupt; to make foul. 

  • To become filled with a pus-like or bile-like substance. 

  • To reach an advanced stage of decomposition. 

sphacelate

verb
  • To affect with gangrene. 

adj
  • Affected with gangrene; necrotic. 

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