Amerind vs American Indian

Amerind and American Indian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Amerind	Yes	Yes	No	No
American Indian	Yes	No	No	No

As nouns, Amerind and American Indian are synonyms defined as:

Amerind (noun)	American Indian (noun)
any of the languages spoken by Amerindians	any of the languages spoken by Amerindians

Amerind (adjective)	American Indian (adjective)
of or pertaining to Native Americans or their culture or languages