Siouan vs Crow language

Siouan and Crow language both are nouns.

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

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

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

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