passion vs eros

passion and eros both are nouns.

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

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

Other hypernyms of passion include concupiscence, physical attraction, sexual desire.

passion (noun)	eros (noun)
the trait of being intensely emotional	a desire for sexual intimacy
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