Pacific Ocean vs Japan

Pacific Ocean and Japan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pacific Ocean	Yes	No	No	No
Japan	Yes	No	No	No

Pacific Ocean (noun)	Japan (noun)
the largest ocean in the world	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