Luxembourg vs European Union

Luxembourg and European Union both are nouns.

Word	Noun	Adjective	Verb	Adverb
Luxembourg	Yes	No	No	No
European Union	Yes	No	No	No

Luxembourg (noun)	European Union (noun)
a grand duchy (a constitutional monarchy) landlocked in northwestern Europe between France and Belgium and Germany; an international financial center	an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members
the capital and largest city of Luxembourg