Denmark vs Kingdom of Denmark

Denmark and Kingdom of Denmark both are nouns.

Word	Noun	Adjective	Verb	Adverb
Denmark	Yes	No	No	No
Kingdom of Denmark	Yes	No	No	No

As nouns, Denmark and Kingdom of Denmark are synonyms defined as:

Denmark and Kingdom of Denmark: a constitutional monarchy in northern Europe; consists of the mainland of Jutland and many islands between the North Sea and the Baltic Sea

Other synonyms of Denmark include Danmark.

Denmark (noun)	Kingdom of Denmark (noun)
a constitutional monarchy in northern Europe; consists of the mainland of Jutland and many islands between the North Sea and the Baltic Sea	a constitutional monarchy in northern Europe; consists of the mainland of Jutland and many islands between the North Sea and the Baltic Sea