Caucasia vs geographic region

Caucasia and geographic region both are nouns.

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

Caucasia (noun)	geographic region (noun)
a large region between the Black and Caspian seas that contains the Caucasus Mountains; oil is its major resource	a demarcated area of the Earth