disaster vs downer

disaster

noun
  • An unforeseen event causing great loss, upset or unpleasantness of whatever kind. 

  • An unexpected natural or man-made catastrophe of substantial extent causing significant physical damage or destruction, loss of life or sometimes permanent change to the natural environment. 

downer

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

  • A livestock animal that has collapsed. 

  • A negative drug trip. 

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

  • A drug that has depressant qualities. 

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