passion vs sexual desire

passion and sexual desire both are nouns.

Word	Noun	Adjective	Verb	Adverb
passion	Yes	No	No	No
sexual desire	Yes	No	No	No

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

Other hypernyms of passion include concupiscence, eros, physical attraction.

passion (noun)	sexual desire (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