Siouan vs Amerindian language

Siouan and Amerindian language both are nouns.

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

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

Siouan (noun)	Amerindian language (noun)
a family of North American Indian languages spoken by the Sioux	any of the languages spoken by Amerindians
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)	Amerindian language (adjective)
of or relating to the Sioux people or their language and culture