bottomward vs dropping

bottomward

adv

  • Toward the bottom of something. 

adj

  • Toward the bottom of something. 

dropping

noun

  • The act of something that drops or falls. 

  • Something dropped; a droplet. 

  • A piece of animal excrement; dung. 

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