Hokkaido vs Ezo

Hokkaido and Ezo both are nouns.

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

As nouns, Hokkaido and Ezo are synonyms defined as:

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

Other synonyms of Hokkaido include Yezo.

Hokkaido (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