Anglesea Island vs Mona

Anglesea Island and Mona both are nouns.

Word	Noun	Adjective	Verb	Adverb
Anglesea Island	Yes	No	No	No
Mona	Yes	No	No	No

As nouns, Anglesea Island and Mona are synonyms defined as:

Other synonyms of Anglesea Island include Anglesea, Anglesey, Anglesey Island.

Anglesea Island (noun)	Mona (noun)
an island to the northwest of Wales	an island to the northwest of Wales