Japanese Archipelago vs archipelago

Japanese Archipelago and archipelago both are nouns.

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

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