Athapaskan vs Indian language

Athapaskan and Indian language both are nouns.

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

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

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

Athapaskan (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