European country vs European nation

European country and European nation both are nouns.

Word	Noun	Adjective	Verb	Adverb
European country	Yes	No	No	No
European nation	Yes	No	No	No

As nouns, European country and European nation are synonyms defined as:

European country and European nation: any one of the countries occupying the European continent

European country (noun)	European nation (noun)
any one of the countries occupying the European continent	any one of the countries occupying the European continent