downer vs stupefacient

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. 

stupefacient

noun
  • Any drug that induces stupor or drowsiness. 

adj
  • Inducing stupor or drowsiness (with a drug such as a narcotic or an anaesthetic). 

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