United Kingdom of Great Britain and Northern Ireland vs burnup

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	burnup (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	the amount of fuel used up (as in a nuclear reactor)
	a high-speed motorcycle race on a public road