unreality vs irreality

unreality and irreality both are nouns.

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

As nouns, unreality and irreality are synonyms defined as:

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

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