coolness vs serenity

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. 

serenity

noun
  • The state of being serene; calmness; peacefulness. 

  • A lack of agitation or disturbance. 

  • A title given to a reigning prince or similar dignitary. 

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