Siouan vs Dakota

Siouan and Dakota both are nouns.

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

As nouns, Dakota is a hyponym of Siouan; that is, Dakota is a word with a more specific, narrower meaning than Siouan:

As nouns, Dakota is a hyponym of Siouan; that is, Dakota is a word with a more specific, narrower meaning than Siouan:

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
Dakota: a member of the Siouan people of the northern Mississippi valley; commonly called the Sioux

Siouan (noun)	Dakota (noun)
a family of North American Indian languages spoken by the Sioux	the Siouan language spoken by the 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	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

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