Europe vs Roman Empire

Europe and Roman Empire both are nouns.

Word	Noun	Adjective	Verb	Adverb
Europe	Yes	No	No	No
Roman Empire	Yes	No	No	No

Europe (noun)	Roman Empire (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	an empire established by Augustus in 27 BC and divided in AD 395 into the Western Roman Empire and the eastern or Byzantine Empire; at its peak lands in Europe and Africa and Asia were ruled by ancient Rome
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