sadness vs trauma

sadness

noun
  • An event in one's life that causes sadness. 

  • The state or emotion of being sad. 

trauma

noun
  • An event that causes great distress. 

  • An emotional wound leading to psychological injury. 

  • Any serious injury to the body, often resulting from violence or an accident. 

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