cottage pie vs United Kingdom of Great Britain and Northern Ireland

cottage pie and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
cottage pie	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

cottage pie (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a dish of minced meat topped with mashed potatoes	a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom