physiognomy vs poker face

physiognomy

noun
  • The art or pseudoscience of deducing the predominant temper and other characteristic qualities of the mind from the outward appearance, especially from the features of the face. 

  • The face or countenance, with respect to the temper of the mind; particular configuration, cast, or expression of countenance, as denoting character. 

  • The general appearance or aspect of a thing, without reference to its scientific characteristics. 

  • The art of telling fortunes by inspection of the features. 

poker face

noun
  • 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. 

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

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