Yezo vs Ezo

Yezo and Ezo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Yezo	Yes	No	No	No
Ezo	Yes	No	No	No

As nouns, Yezo and Ezo are synonyms defined as:

Yezo and Ezo: the second largest of the four main islands of Japan; to the north of Honshu

Other synonyms of Yezo include Hokkaido.

Yezo (noun)	Ezo (noun)
the second largest of the four main islands of Japan; to the north of Honshu	the second largest of the four main islands of Japan; to the north of Honshu