passionate vs poker face

passionate

noun
  • A passionate individual. 

adj
  • Given to strong feeling, sometimes romantic, sexual, or both. 

  • Fired with intense feeling. 

poker face

noun
  • Any similar expression used to prevent giving away one's motives, feelings, or situation. 

  • An impassive facial expression cultivated to prevent other players from determining whether one's actions in the game are the result of a quality hand, or of bluffing. 

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