Hokkaido vs Yezo

Hokkaido and Yezo both are nouns.

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

As nouns, Hokkaido and Yezo are synonyms defined as:

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

Other synonyms of Hokkaido include Ezo.

Hokkaido (noun)	Yezo (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