reversible vs irreversible

reversible is a noun but irreversible is not a noun.

Word	Noun	Adjective	Verb	Adverb
reversible	Yes	Yes	No	No
irreversible	No	Yes	No	No

reversible (noun)	irreversible (noun)
a garment (especially a coat) that can be worn inside out (with either side of the cloth showing)

reversible (adjective)	irreversible (adjective)
capable of reversing or being reversed	incapable of being reversed
capable of being reversed or used with either side out
capable of assuming or producing either of two states
capable of being reversed