American Indian language vs Amerindian language

American Indian language and Amerindian language both are nouns.

Word	Noun	Adjective	Verb	Adverb
American Indian language	Yes	No	No	No
Amerindian language	Yes	No	No	No

As nouns, American Indian language and Amerindian language are synonyms defined as:

American Indian language and Amerindian language: any of the languages spoken by Amerindians

Other synonyms of American Indian language include American-Indian language, American Indian, Amerind, Amerind language, Indian, Indian language.

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