dropping vs exhausted

dropping

noun
  • The act of something that drops or falls. 

  • Something dropped; a droplet. 

  • A piece of animal excrement; dung. 

exhausted

adj
  • Emptied of contents, especially of air; that has been made into a vacuum. 

  • Very tired; in a state of exhaustion. 

  • Depleted of resources. 

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