putrefaction vs senescence

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. 

senescence

noun
  • Condition when the cell ceases to divide. 

  • Old age; accumulated damage to macromolecules, cells, tissues and organs with the passage of time. 

  • The state or process of ageing, especially in humans; old age. 

  • Fruit senescence, leading to ripening of fruit. 

  • Ceasing to divide by mitosis because of shortening of telomeres or excessive DNA damage. 

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