Navaho vs Athabascan

Navaho and Athabascan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Navaho	Yes	No	No	No
Athabascan	Yes	No	No	No

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

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

Other hypernyms of Navaho include Athabaskan, Athapascan, Athapaskan, Athapaskan language.

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

Navaho: a member of an Athapaskan people that migrated to Arizona and New Mexico and Utah
Athabascan: 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

Other hypernyms of Navaho include Athabaskan, Athapascan, Athapaskan.

Navaho (noun)	Athabascan (noun)
the Athapaskan language spoken by the Navaho	a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)
a member of an Athapaskan people that migrated to Arizona and New Mexico and Utah	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