skillage vs sleight of hand

skillage

noun
  • The state of being highly skilled, the state of being skillful. 

  • The differentiating, or skilling, of call distribution based on an individual's skill level, expertise, or training. 

sleight of hand

noun
  • A performance of such skill. 

  • The required digital dexterity behind magic tricks and illusions. 

  • Any form of skillful deception. 

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