Navajo vs Athapaskan

Navajo and Athapaskan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Navajo	Yes	No	No	No
Athapaskan	Yes	No	No	No

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

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

Other hypernyms of Navajo include Athabascan, Athabaskan, Athapascan, Athapaskan language.

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

Navajo: a member of an Athapaskan people that migrated to Arizona and New Mexico and Utah
Athapaskan: 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 Navajo include Athabascan, Athabaskan, Athapascan.

Navajo (noun)	Athapaskan (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