quietus vs suicidal

quietus

noun
  • Death. 

  • Final settlement (e.g., of a debt). 

  • A stillness or pause; something that quiets or represses; removal from activity. 

suicidal

noun
  • Someone suicidal; someone likely to kill themselves. 

adj
  • Likely to commit, or to attempt to commit, suicide. 

  • Extremely reckless. 

  • Highly likely to certain to result in the deaths of the participants; dangerous or reckless to such a degree as to be tantamount to suicide for those taking part. 

  • Pertaining to suicide. 

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