Navaho vs Athapaskan language

Navaho and Athapaskan language both are nouns.

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

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

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

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

Navaho (noun)	Athapaskan language (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