Edo vs capital of Japan

Edo and capital of Japan both are nouns.

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

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

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

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

Edo (noun)	capital of Japan (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
a member of a west African people living in the tropical forest region of southern Nigeria