archipelago vs Leeward Islands

archipelago and Leeward Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
archipelago	Yes	No	No	No
Leeward Islands	Yes	No	No	No

archipelago (noun)	Leeward Islands (noun)
a group of many islands in a large body of water	a group of islands in the eastern West Indies