caries vs putrefaction

caries

noun
  • The progressive destruction of bone or tooth by decay 

putrefaction

noun
  • Rotten material. 

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

  • The state of being rotten. 

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