putrefaction vs sterility

putrefaction

noun
  • The act of causing to rot; the anaerobic splitting of proteins by bacteria and fungi with the formation of malodorous, incompletely oxidized products. 

  • Rotten material. 

  • The state of being rotten. 

sterility

noun
  • The state or quality of being sterile. 

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