Eskimo-Aleut vs Eskimo

Eskimo-Aleut and Eskimo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eskimo-Aleut	Yes	No	No	No
Eskimo	Yes	No	No	No

As nouns, Eskimo is a hyponym of Eskimo-Aleut; that is, Eskimo is a word with a more specific, narrower meaning than Eskimo-Aleut:

Other hyponyms of Eskimo-Aleut include Eskimo language, Esquimau, Esquimau language, Aleut, Aleut language.

Eskimo-Aleut (noun)	Eskimo (noun)
the family of languages that includes Eskimo and Aleut	the language spoken by the Eskimo
	a member of a people inhabiting the Arctic (northern Canada or Greenland or Alaska or eastern Siberia); the Algonquians called them Eskimo (`eaters of raw flesh') but they call themselves the Inuit (`the people')