ardor vs passion

ardor and passion both are nouns.

Word	Noun	Adjective	Verb	Adverb
ardor	Yes	No	No	No
passion	Yes	No	No	No

As nouns, passion is a hypernym of ardor; that is, passion is a word with a broader meaning than ardor:

Other hypernyms of ardor include passionateness.

ardor (noun)	passion (noun)
intense feeling of love	the trait of being intensely emotional
a feeling of strong eagerness (usually in favor of a person or cause)	any object of warm affection or devotion
feelings of great warmth and intensity	a strong feeling or emotion
	a feeling of strong sexual desire
	an irrational but irresistible motive for a belief or action
	something that is desired intensely