possession vs ownership

possession and ownership both are nouns.

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

As nouns, possession and ownership are synonyms defined as:

possession (noun)	ownership (noun)
anything owned or possessed	the act of having and controlling property
the act of having and controlling property	the relation of an owner to the thing possessed; possession with the right to transfer possession to others
(sport) the act of controlling the ball (or puck)	the state or fact of being an owner
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