H.I. vs archipelago

H.I. and archipelago both are nouns.

Word	Noun	Adjective	Verb	Adverb
H.I.	Yes	No	No	No
archipelago	Yes	No	No	No

H.I. (noun)	archipelago (noun)
a group of volcanic and coral islands in the central Pacific	a group of many islands in a large body of water