Shoshoni vs Amerindian

Shoshoni and Amerindian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Shoshoni	Yes	No	No	No
Amerindian	Yes	No	No	No

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

Shoshoni: a member of the North American Indian people (related to the Aztecs) of the southwestern United States
Amerindian: any member of the peoples living in North or South America before the Europeans arrived

Other hypernyms of Shoshoni include Native American.

Shoshoni (noun)	Amerindian (noun)
a member of the North American Indian people (related to the Aztecs) of the southwestern United States	any member of the peoples living in North or South America before the Europeans arrived