archipelago vs Japan

archipelago and Japan both are nouns.

Word	Noun	Adjective	Verb	Adverb
archipelago	Yes	No	No	No
Japan	Yes	No	No	No

archipelago (noun)	Japan (noun)
a group of many islands in a large body of water	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