American Indian language vs Indian language

American Indian language and Indian language both are nouns.

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

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

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

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

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