falsity vs unreality

falsity and unreality both are nouns.

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

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

falsity: the state of being false or untrue
unreality: the state of being insubstantial or imaginary; not existing objectively or in fact

Other hypernyms of falsity include irreality.

falsity (noun)	unreality (noun)
a false statement	the quality possessed by something that is unreal
the state of being false or untrue	ineptitude in dealing with reality.
	the state of being insubstantial or imaginary; not existing objectively or in fact