human face vs facial

human face and facial both are nouns.

Word	Noun	Adjective	Verb	Adverb
human face	Yes	No	No	No
facial	Yes	Yes	No	No

human face (noun)	facial (noun)
the front of the human head from the forehead to the chin and ear to ear	care for the face that usually involves cleansing and massage and the application of cosmetic creams
	cranial nerve that supplies facial muscles

human face (adjective)	facial (adjective)
	of or concerning the face
	of or pertaining to the outside surface of an object