Amerindian language vs American Indian language

Amerindian language and American Indian language both are nouns.

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

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

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

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

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