appetency vs penchant

appetency

noun
  • Strong desire; craving; powerful instinct. 

penchant

noun
  • Taste, liking, or inclination (for). 

  • A card game resembling bezique. 

  • In the game of penchant, any queen and jack of different suits held at the same time. 

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