Montserrat vs island

Montserrat and island both are nouns.

Word	Noun	Adjective	Verb	Adverb
Montserrat	Yes	No	No	No
island	Yes	No	No	No

Montserrat (noun)	island (noun)
a volcanic island in the Caribbean; in the West Indies	a zone or area resembling an island
	a land mass (smaller than a continent) that is surrounded by water