Africa vs Nubia

Africa and Nubia both are nouns.

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

Africa (noun)	Nubia (noun)
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	an ancient region of northeastern Africa (southern Egypt and northern Sudan) on the Nile; much of Nubia is now under Lake Nasser