capital of Japan vs Tokyo

capital of Japan and Tokyo both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Japan	Yes	No	No	No
Tokyo	Yes	No	No	No

As nouns, capital of Japan and Tokyo are synonyms defined as:

capital of Japan and Tokyo: the capital and largest city of Japan; the economic and cultural center of Japan

Other synonyms of capital of Japan include Edo, Japanese capital, Tokio, Yeddo, Yedo.

capital of Japan (noun)	Tokyo (noun)
the capital and largest city of Japan; the economic and cultural center of Japan	the capital and largest city of Japan; the economic and cultural center of Japan