irreality vs falseness

irreality and falseness both are nouns.

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

As nouns, falseness is a hyponym of irreality; that is, falseness is a word with a more specific, narrower meaning than irreality:

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

Other hyponyms of irreality include cloud, falsity.

irreality (noun)	falseness (noun)
the state of being insubstantial or imaginary; not existing objectively or in fact	the quality of not being open or truthful; deceitful or hypocritical
	unfaithfulness by virtue of being unreliable or treacherous
	the state of being false or untrue