falseness vs unreality

falseness and unreality both are nouns.

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

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

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

Other hypernyms of falseness include irreality.

falseness (noun)	unreality (noun)
the quality of not being open or truthful; deceitful or hypocritical	the quality possessed by something that is unreal
unfaithfulness by virtue of being unreliable or treacherous	ineptitude in dealing with reality.
the state of being false or untrue	the state of being insubstantial or imaginary; not existing objectively or in fact