United Kingdom of Great Britain and Northern Ireland vs cantankerous

United Kingdom of Great Britain and Northern Ireland is a noun but cantankerous is not a noun.

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

United Kingdom of Great Britain and Northern Ireland (noun)	cantankerous (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

United Kingdom of Great Britain and Northern Ireland (adjective)	cantankerous (adjective)
	having a difficult and contrary disposition
	stubbornly obstructive and unwilling to cooperate