Union of Serbia and Montenegro vs European nation

Union of Serbia and Montenegro and European nation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Union of Serbia and Montenegro	Yes	No	No	No
European nation	Yes	No	No	No

Union of Serbia and Montenegro (noun)	European nation (noun)
a mountainous republic in southeastern Europe bordering on the Adriatic Sea; formed from two of the six republics that made up Yugoslavia until 1992; Serbia and Montenegro were known as the Federal Republic of Yugoslavia until 2003 when they adopted the name of the Union of Serbia and Montenegro	any one of the countries occupying the European continent