passivity vs phlegm

passivity

noun
  • The state of being passive. 

  • A lack of initiative. 

  • Submissiveness. 

phlegm

noun
  • Calmness of temperament, composure; also seen negatively, sluggishness, indifference. 

  • One of the four humors making up the body in ancient and mediaeval medicine; said to be cold and moist, and often identified with mucus. 

  • Viscid mucus produced by the body, later especially mucus expelled from the bronchial passages by coughing. 

  • A watery distillation, especially one obtained from plant matter; an aqueous solution. 

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