unreality vs nonentity

unreality and nonentity both are nouns.

Word	Noun	Adjective	Verb	Adverb
unreality	Yes	No	No	No
nonentity	Yes	No	No	No

As nouns, nonentity is a hypernym of unreality; that is, nonentity is a word with a broader meaning than unreality:

unreality: the state of being insubstantial or imaginary; not existing objectively or in fact
nonentity: the state of not existing

Other hypernyms of unreality include nonexistence.

unreality (noun)	nonentity (noun)
the quality possessed by something that is unreal	a person of no influence
ineptitude in dealing with reality.	the state of not existing
the state of being insubstantial or imaginary; not existing objectively or in fact