United Kingdom of Great Britain and Northern Ireland vs piss-up

United Kingdom of Great Britain and Northern Ireland and piss-up both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
piss-up	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	piss-up (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	vulgar expression for a bout of heavy drinking