linguistics vs unacceptable

linguistics is a noun but unacceptable is not a noun.

Word	Noun	Adjective	Verb	Adverb
linguistics	Yes	No	No	No
unacceptable	No	Yes	No	No

linguistics (noun)	unacceptable (noun)
the scientific study of language
the humanistic study of language and literature

linguistics (adjective)	unacceptable (adjective)
	not acceptable; not welcome
	(used of persons or their behavior) not acceptable or reasonable
	not conforming to standard usage
	not adequate to give satisfaction