Dic: Synonyms: passion, fervor, fire, zeal, ardor

These nouns denote powerful, intense emotion.

• Passion is a deep, overwhelming emotion:
  ... "There is not a passion so strongly rooted in the human heart as envy" (Richard Brinsley Sheridan).
  The term may signify sexual desire or anger:
  ... "He flew into a violent passion and abused me mercilessly" (H.G. Wells).
• Fervor is great warmth and intensity of feeling:
  ... "The union of the mathematician with the poet, fervor with measure, passion with correctness, this surely is the ideal" (William James).
• Fire is burning passion:
  ... "In our youth our hearts were touched with fire" (Oliver Wendell Holmes, Jr.)
• Zeal is strong, enthusiastic devotion to a cause, ideal, or goal and tireless diligence in its furtherance:
  ... "Laurie [resolved], with a glow of philanthropic zeal, to found and endow an institution for ... women with artistic tendencies" (Louisa May Alcott).
• Ardor is fiery intensity of feeling:
  ... "the furious ardor of my zeal repressed" (Charles Churchill).

... The American Heritage