archipelago vs Japanese Archipelago

archipelago and Japanese Archipelago both are nouns.

Word	Noun	Adjective	Verb	Adverb
archipelago	Yes	No	No	No
Japanese Archipelago	Yes	No	No	No

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