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

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	top-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	an amount needed to restore something to its former level