perishing vs rotting

perishing

noun
  • The act of something that perishes; decay or destruction. 

adj
  • Extreme; used of environmental or bodily conditions. 

  • Extremely cold. 

rotting

noun
  • The process by which something rots. 

  • Material that has rotted. 

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