preteen vs immature

preteen is a noun but immature is not a noun.

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

preteen (noun)	immature (noun)
a preadolescent boy or girl (usually between 9 and 12 years of age)

preteen (adjective)	immature (adjective)
of or relating to or designed for children between the ages of 9 and 12	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