Tokio vs Yedo

Tokio and Yedo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tokio	Yes	No	No	No
Yedo	Yes	No	No	No

As nouns, Tokio and Yedo are synonyms defined as:

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

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

Tokio (noun)	Yedo (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