coolness vs self-possession

coolness

noun
  • The state of being cool, i.e. calm. 

  • Indifference; lack of passion or interest. 

  • The state of being cool, i.e. good or pleasing. 

  • The result or product of being cool, i.e. good or pleasing. 

  • The state of being cool, i.e. chilly. 

  • The result or product of being cool, i.e. chilly. 

self-possession

noun
  • calmness and composure, especially when under stress 

  • confidence in one's own powers 

How often have the words coolness and self-possession occurred in a corpus of books? (source: Google Ngram Viewer )