island vs Mona

island and Mona both are nouns.

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

island (noun)	Mona (noun)
a zone or area resembling an island	an island to the northwest of Wales
a land mass (smaller than a continent) that is surrounded by water