Dakota vs geographic region

Dakota and geographic region both are nouns.

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

Dakota (noun)	geographic region (noun)
the Siouan language spoken by the Dakota	a demarcated area of the Earth
the area of the states of North Dakota and South Dakota
a member of the Siouan people of the northern Mississippi valley; commonly called the Sioux