Dakota vs Siouan language

Dakota and Siouan language both are nouns.

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

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

Dakota: the Siouan language spoken by the Dakota
Siouan language: a family of North American Indian languages spoken by the Sioux

Other hypernyms of Dakota include Siouan.

Dakota (noun)	Siouan language (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 the Siouan people of the northern Mississippi valley; commonly called the Sioux