Sumer vs geographical region

Sumer and geographical region both are nouns.

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

Sumer (noun)	geographical region (noun)
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	a demarcated area of the Earth