United Kingdom of Great Britain and Northern Ireland vs tuck box

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	tuck box (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	a box for storing eatables (especially at boarding school)