geographical region vs Sumer

geographical region and Sumer both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
Sumer	Yes	No	No	No

geographical region (noun)	Sumer (noun)
a demarcated area of the Earth	an area in the southern region of Babylonia in present-day Iraq; site of the Sumerian civilization of city-states that flowered during the third millennium BC