geographic region vs Caucasus

geographic region and Caucasus both are nouns.

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

geographic region (noun)	Caucasus (noun)
a demarcated area of the Earth	a large region between the Black and Caspian seas that contains the Caucasus Mountains; oil is its major resource
	the mountain range in Caucasia between the Black Sea and the Caspian Sea that forms part of the traditional border between Europe and Asia