irreversible vs reversible

irreversible is not a noun while reversible is a noun.

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

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

irreversible (adjective)	reversible (adjective)
incapable of being reversed	capable of reversing or 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