ardency vs passion

ardency

noun
  • Intensity of feelings. 

  • Intensity of devotion. 

  • Intensity of light. 

  • Intensity of heat or burning. 

passion

noun
  • Any great, strong, powerful emotion, especially romantic love or extreme hate. 

  • Fervor, determination. 

  • A display, musical composition, or play meant to commemorate the suffering of Jesus. 

  • The suffering of Jesus leading up to and during his crucifixion. 

  • An object of passionate or romantic love or strong romantic interest. 

  • A true desire sustained or prolonged. 

  • Sexual intercourse, especially when very emotional. 

verb
  • To give a passionate character to. 

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