Black Africa vs Africa

Black Africa and Africa both are nouns.

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

Black Africa (noun)	Africa (noun)
the region of Africa to the south of the Sahara Desert	the second largest continent; located to the south of Europe and bordered to the west by the South Atlantic and to the east by the Indian Ocean