immature vs adolescent

immature is not a noun while adolescent is a noun.

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

immature (noun)	adolescent (noun)
	a juvenile between the onset of puberty and maturity

immature (adjective)	adolescent (adjective)
not yet mature	relating to or peculiar to or suggestive of an adolescent
characteristic of a lack of maturity	in the state of development between puberty and maturity
(used of living things especially persons) in an early period of life or development or growth	displaying or suggesting a lack of maturity
(of birds) not yet having developed feathers	being of the age 13 through 19
not fully developed or mature; not ripe