different between irrealism vs irrealis

English

irreal +? -ism

irrealism (usually uncountable, plural irrealisms)

(philosophy) The belief that phenomenalism and physicalism are alternative "world-versions", both useful in some circumstances, but neither capable of fully capturing the other.
(art) A style that features an estrangement from our generally accepted sense of reality.

irrealis (not comparable)

(grammar, of a verb) inflected to indicate that an act or state of being is not a fact.
Although the only irrealis mood in English is the subjunctive mood, some other languages include additional irrealis moods, including cohortative, jussive, speculative, and optative.

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