Indian vs American-Indian language

Indian and American-Indian language both are nouns.

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

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

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

Indian (noun)	American-Indian language (noun)
any of the languages spoken by Amerindians	any of the languages spoken by Amerindians
a native or inhabitant of India

Indian (adjective)	American-Indian language (adjective)
of or relating to or characteristic of India or the East Indies or their peoples or languages or cultures
of or pertaining to Native Americans or their culture or languages