Japan vs Iwo Jima

Japan and Iwo Jima both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japan	Yes	No	No	No
Iwo Jima	Yes	No	No	No

Japan (noun)	Iwo Jima (noun)
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building	a bloody and prolonged operation on the island of Iwo Jima in which American marines landed and defeated Japanese defenders (February and March 1945)
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	the largest of the Volcano Islands of Japan