Black African vs African

Black African and African both are nouns.

Word	Noun	Adjective	Verb	Adverb
Black African	Yes	No	No	No
African	Yes	Yes	No	No

As nouns, African is a hypernym of Black African; that is, African is a word with a broader meaning than Black African:

Black African (noun)	African (noun)
an African who is Black	a native or inhabitant of Africa

Black African (adjective)	African (adjective)
	of or relating to the nations of Africa or their peoples