preadolescent vs preteen

preadolescent is not a noun while preteen is a noun.

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

As adjectives, preadolescent and preteen are synonyms defined as:

preadolescent and preteen: of or relating to or designed for children between the ages of 9 and 12

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

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