Basque vs European

Basque and European both are nouns.

Word	Noun	Adjective	Verb	Adverb
Basque	Yes	No	No	No
European	Yes	Yes	No	No

As nouns, European is a hypernym of Basque; that is, European is a word with a broader meaning than Basque:

Basque: a member of a people of unknown origin living in the western Pyrenees in France and Spain
European: a native or inhabitant of Europe

Basque (noun)	European (noun)
the language of the Basque people; of no known relation to any other language	a native or inhabitant of Europe
a member of a people of unknown origin living in the western Pyrenees in France and Spain

Basque (adjective)	European (adjective)
	of or relating to or characteristic of Europe or the people of Europe