human face vs human

human face and human both are nouns.

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

human face (noun)	human (noun)
the front of the human head from the forehead to the chin and ear to ear	any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage

human face (adjective)	human (adjective)
	having human form or attributes as opposed to those of animals or divine beings
	characteristic of humanity
	relating to a person