self-will vs possession

self-will and possession both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-will	Yes	No	No	No
possession	Yes	No	No	No

As nouns, self-will and possession are synonyms defined as:

self-will and possession: the trait of resolutely controlling your own behavior

Other synonyms of self-will include self-command, self-control, self-possession, will power, willpower.

self-will (noun)	possession (noun)
resolute adherence to your own ideas or desires	anything owned or possessed
the trait of resolutely controlling your own behavior	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