United Kingdom of Great Britain and Northern Ireland vs book token

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	book token (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 gift voucher that can be exchanged for books costing up to an amount given on the voucher