Dakota vs Siouan

Dakota and Siouan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dakota	Yes	No	No	No
Siouan	Yes	Yes	No	No

As nouns, Siouan is a hypernym of Dakota; that is, Siouan is a word with a broader meaning than Dakota:

Other hypernyms of Dakota include Siouan language.

As nouns, Siouan is a hypernym of Dakota; that is, Siouan is a word with a broader meaning than Dakota:

Dakota: a member of the Siouan people of the northern Mississippi valley; commonly called the Sioux
Siouan: a member of a group of North American Indian peoples who spoke a Siouan language and who ranged from Lake Michigan to the Rocky Mountains

Other hypernyms of Dakota include Sioux.

Dakota (noun)	Siouan (noun)
the Siouan language spoken by the Dakota	a family of North American Indian languages spoken by the Sioux
the area of the states of North Dakota and South Dakota	a member of a group of North American Indian peoples who spoke a Siouan language and who ranged from Lake Michigan to the Rocky Mountains
a member of the Siouan people of the northern Mississippi valley; commonly called the Sioux

Dakota (adjective)	Siouan (adjective)
	of or relating to the Sioux people or their language and culture