possession vs dominion

possession and dominion both are nouns.

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

As nouns, dominion is a hypernym of possession; that is, dominion is a word with a broader meaning than possession:

Other hypernyms of possession include district, territorial dominion, territory.

possession (noun)	dominion (noun)
anything owned or possessed	a region marked off for administrative or other purposes
the act of having and controlling property	dominance or power through legal authority
(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