Sub-Saharan Africa vs Africa

Sub-Saharan Africa and Africa both are nouns.

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

Sub-Saharan 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