European nation vs European country

European nation and European country both are nouns.

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

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

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

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