madman vs sicko

madman

noun
  • A male who is insane or mentally disturbed. 

sicko

noun
  • A mentally ill person. 

  • A person with unpleasant tastes, views or habits. 

  • A physically ill person. 

adj
  • Characterized by depraved tastes or habits; deviant. 

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