Black Africa vs Sub-Saharan Africa

Black Africa and Sub-Saharan Africa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Black Africa	Yes	No	No	No
Sub-Saharan Africa	Yes	No	No	No

As nouns, Black Africa and Sub-Saharan Africa are synonyms defined as:

Black Africa and Sub-Saharan Africa: the region of Africa to the south of the Sahara Desert

Black Africa (noun)	Sub-Saharan Africa (noun)
the region of Africa to the south of the Sahara Desert	the region of Africa to the south of the Sahara Desert