Volcano Islands vs Japan

Volcano Islands and Japan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Volcano Islands	Yes	No	No	No
Japan	Yes	No	No	No

Volcano Islands (noun)	Japan (noun)
a group of Japanese Islands in the northwestern Pacific Ocean to the north of the Marianas	a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building
	a string of more than 3,000 islands to the east of Asia extending 1,300 miles between the Sea of Japan and the western Pacific Ocean