possession vs monomania

possession and monomania both are nouns.

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

As nouns, possession and monomania are synonyms defined as:

possession (noun)	monomania (noun)
anything owned or possessed	a mania restricted to one thing or idea
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