anesthetic vs downer

anesthetic

noun
  • A substance administered to reduce the perception of pain or to induce numbness for surgery and may render the recipient unconscious. 

adj
  • Insensate: unable to feel, or unconscious. 

  • Causing anesthesia; reducing pain sensitivity. 

downer

noun
  • A drug that has depressant qualities. 

  • A livestock animal that has collapsed. 

  • A negative drug trip. 

  • A form of industrial action in which workers down tools and refuse to work. 

  • Something or someone disagreeable, dispiriting or depressing; a killjoy. 

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