Tuvalu vs archipelago

Tuvalu and archipelago both are nouns.

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

Tuvalu (noun)	archipelago (noun)
a small island republic on the Tuvalu islands; formerly part of the British colony of Gilbert and Ellice Islands until it withdrew in 1975 and became independent of the United Kingdom in 1978	a group of many islands in a large body of water
a group of coral islands in Micronesia to the southwest of Hawaii