Belgium vs Belgique

Belgium and Belgique both are nouns.

Word	Noun	Adjective	Verb	Adverb
Belgium	Yes	No	No	No
Belgique	Yes	No	No	No

As nouns, Belgium and Belgique are synonyms defined as:

Belgium and Belgique: a monarchy in northwestern Europe; headquarters for the European Union and for the North Atlantic Treaty Organization

Other synonyms of Belgium include Kingdom of Belgium.

Belgium (noun)	Belgique (noun)
a monarchy in northwestern Europe; headquarters for the European Union and for the North Atlantic Treaty Organization	a monarchy in northwestern Europe; headquarters for the European Union and for the North Atlantic Treaty Organization