Athinai vs capital of Greece

Athinai and capital of Greece both are nouns.

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

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

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

Other synonyms of Athinai include Athens, Greek capital.

Athinai (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)