Athabaskan vs Indian language

Athabaskan and Indian language both are nouns.

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

As nouns, Indian language is a hypernym of Athabaskan; that is, Indian language is a word with a broader meaning than Athabaskan:

Athabaskan: a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)
Indian language: any of the languages spoken by Amerindians

Athabaskan (noun)	Indian language (noun)
a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)	any of the languages spoken by Amerindians
a member of any of the North American Indian groups speaking an Athapaskan language and living in the subarctic regions of western Canada and central Alaska