ploughman's lunch vs United Kingdom of Great Britain and Northern Ireland

ploughman's lunch and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
ploughman's lunch	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

ploughman's lunch (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
a meal consisting of a sandwich of bread and cheese and a salad	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