American Indian language vs American Indian

American Indian language and American Indian both are nouns.

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

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

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

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

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