geographic region vs Nubia

geographic region and Nubia both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographic region	Yes	No	No	No
Nubia	Yes	No	No	No

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