Shoshone vs Amerindian

Shoshone and Amerindian both are nouns.

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

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

Shoshone: 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 Shoshone include Native American.

Shoshone (noun)	Amerindian (noun)
the language spoken by the Shoshone (belonging to the Uto-Aztecan family)	any member of the peoples living in North or South America before the Europeans arrived
a member of the North American Indian people (related to the Aztecs) of the southwestern United States