Athens vs capital of Greece

Athens and capital of Greece both are nouns.

Word	Noun	Adjective	Verb	Adverb
Athens	Yes	No	No	No
capital of Greece	Yes	No	No	No

As nouns, Athens and capital of Greece are synonyms defined as:

Athens and capital of Greece: the capital and largest city of Greece; named after Athena (its patron goddess)

Other synonyms of Athens include Athinai, Greek capital.

Athens (noun)	capital of Greece (noun)
the capital and largest city of Greece; named after Athena (its patron goddess)	the capital and largest city of Greece; named after Athena (its patron goddess)
a university town in northeast Georgia
a town in southeast Ohio