fervency vs passion

fervency and passion both are nouns.

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

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

Other hypernyms of fervency include passionateness.

fervency (noun)	passion (noun)
feelings of great warmth and intensity	the trait of being intensely emotional
	any object of warm affection or devotion
	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