United Kingdom of Great Britain and Northern Ireland vs cottage pie

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	cottage pie (noun)
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	a dish of minced meat topped with mashed potatoes