Europe vs Republic of Bulgaria

Europe and Republic of Bulgaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
Europe	Yes	No	No	No
Republic of Bulgaria	Yes	No	No	No

Europe (noun)	Republic of Bulgaria (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	a republic in the eastern part of the Balkan Peninsula in southeastern Europe
the nations of the European continent collectively
the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles