Caucasus vs Caucasian

Caucasus and Caucasian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Caucasus	Yes	No	No	No
Caucasian	Yes	Yes	No	No

Caucasus (noun)	Caucasian (noun)
a large region between the Black and Caspian seas that contains the Caucasus Mountains; oil is its major resource	a number of languages spoken in the Caucasus that are unrelated to languages spoken elsewhere
the mountain range in Caucasia between the Black Sea and the Caspian Sea that forms part of the traditional border between Europe and Asia	a person of European descent with a light-skinned or pale complexion

Caucasus (adjective)	Caucasian (adjective)
	of or relating to the geographical region of Caucasia
	of or relating to Caucasian people