depressant vs downer

depressant

noun
  • A pharmacological substance which decreases neuronal or physiological activity. 

  • An agent that inhibits the flotation of a mineral or minerals. 

adj
  • reducing functional or nervous activity. 

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 depressant and downer occurred in a corpus of books? (source: Google Ngram Viewer )