maturity vs immature

maturity is a noun but immature is not a noun.

Word	Noun	Adjective	Verb	Adverb
maturity	Yes	No	No	No
immature	No	Yes	No	No

maturity (noun)	immature (noun)
state of being mature; full development
the period of time in your life after your physical growth has stopped and you are fully developed
the date on which an obligation must be repaid

maturity (adjective)	immature (adjective)
	not yet mature
	characteristic of a lack of maturity
	(used of living things especially persons) in an early period of life or development or growth
	(of birds) not yet having developed feathers
	not fully developed or mature; not ripe