Kingdom of Belgium vs Common Market

Kingdom of Belgium and Common Market both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kingdom of Belgium	Yes	No	No	No
Common Market	Yes	No	No	No

Kingdom of Belgium (noun)	Common Market (noun)
a monarchy in northwestern Europe; headquarters for the European Union and for the North Atlantic Treaty Organization	an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members