Mona vs Anglesea

Mona and Anglesea both are nouns.

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

As nouns, Mona and Anglesea are synonyms defined as:

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

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