Athabascan vs Indian language

Athabascan and Indian language both are nouns.

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

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

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

Athabascan (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