ownership vs possession

ownership and possession both are nouns.

Word	Noun	Adjective	Verb	Adverb
ownership	Yes	No	No	No
possession	Yes	No	No	No

As nouns, ownership and possession are synonyms defined as:

ownership (noun)	possession (noun)
the act of having and controlling property	anything owned or possessed
the relation of an owner to the thing possessed; possession with the right to transfer possession to others	the act of having and controlling property
the state or fact of being an owner	(sport) the act of controlling the ball (or puck)
	the trait of resolutely controlling your own behavior
	a territory that is controlled by a ruling state
	a mania restricted to one thing or idea
	being controlled by passion or the supernatural