Edo vs Tokyo

Edo and Tokyo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Edo	Yes	No	No	No
Tokyo	Yes	No	No	No

As nouns, Edo and Tokyo are synonyms defined as:

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

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

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