dropping vs spent

dropping

noun
  • The act of something that drops or falls. 

  • Something dropped; a droplet. 

  • A piece of animal excrement; dung. 

spent

adj
  • Consumed, used up, exhausted, depleted. 

  • Of fish: exhausted as a result of having spawned. 

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