acculturation vs acculturational

acculturation is a noun but acculturational is not a noun.

Word	Noun	Adjective	Verb	Adverb
acculturation	Yes	No	No	No
acculturational	No	Yes	No	No

acculturation (noun)	acculturational (noun)
the adoption of the behavior patterns of the surrounding culture
all the knowledge and values shared by a society
the process of assimilating new ideas into an existing cognitive structure

acculturation (adjective)	acculturational (adjective)
	of or relating to acculturation