Circassian vs Caucasus

Circassian and Caucasus both are nouns.

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

Circassian (noun)	Caucasus (noun)
a northern Caucasian language spoken by the Circassian	a large region between the Black and Caspian seas that contains the Caucasus Mountains; oil is its major resource
a mostly Sunni Muslim community living in northwestern Caucasia	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 member of the Sunni Muslim people living in northwestern Caucasia