Eire vs Ireland

Eire and Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eire	Yes	No	No	No
Ireland	Yes	No	No	No

As nouns, Eire and Ireland are synonyms defined as:

Eire and Ireland: a republic consisting of 26 of 32 counties comprising the island of Ireland; achieved independence from the United Kingdom in 1921

Other synonyms of Eire include Irish Republic, Republic of Ireland.

Eire (noun)	Ireland (noun)
a republic consisting of 26 of 32 counties comprising the island of Ireland; achieved independence from the United Kingdom in 1921	an island comprising the republic of Ireland and Northern Ireland
	a republic consisting of 26 of 32 counties comprising the island of Ireland; achieved independence from the United Kingdom in 1921