irreality vs falsity

irreality and falsity both are nouns.

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

As nouns, falsity is a hyponym of irreality; that is, falsity 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
falsity: the state of being false or untrue

Other hyponyms of irreality include cloud, falseness.

irreality (noun)	falsity (noun)
the state of being insubstantial or imaginary; not existing objectively or in fact	a false statement
	the state of being false or untrue