Hibernia vs Emerald Isle

Hibernia and Emerald Isle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hibernia	Yes	No	No	No
Emerald Isle	Yes	No	No	No

As nouns, Hibernia and Emerald Isle are synonyms defined as:

Hibernia and Emerald Isle: an island comprising the republic of Ireland and Northern Ireland

Other synonyms of Hibernia include Ireland.

Hibernia (noun)	Emerald Isle (noun)
an island comprising the republic of Ireland and Northern Ireland	an island comprising the republic of Ireland and Northern Ireland