passion vs passionateness

passion and passionateness both are nouns.

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

As nouns, passion and passionateness are synonyms defined as:

passion (noun)	passionateness (noun)
the trait of being intensely emotional	a strong feeling or emotion
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