Sub-Saharan Africa vs Black Africa

Sub-Saharan Africa and Black Africa both are nouns.

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

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

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

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