Athabascan vs Athapaskan language

Athabascan and Athapaskan language both are nouns.

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

As nouns, Athabascan and Athapaskan language are synonyms defined as:

Athabascan and Athapaskan language: a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)

Other synonyms of Athabascan include Athabaskan, Athapascan, Athapaskan.

Athabascan (noun)	Athapaskan language (noun)
a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)	a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)
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