mania vs possession

mania and possession both are nouns.

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

As nouns, possession is a hyponym of mania; that is, possession is a word with a more specific, narrower meaning than mania:

mania (noun)	possession (noun)
an irrational but irresistible motive for a belief or action	anything owned or possessed
a mood disorder; an affective disorder in which the victim tends to respond excessively and sometimes violently	the act of having and controlling property
	(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