book token vs Great Britain

book token and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
book token	Yes	No	No	No
Great Britain	Yes	No	No	No

book token (noun)	Great Britain (noun)
a gift voucher that can be exchanged for books costing up to an amount given on the voucher	an island comprising England and Scotland and Wales
	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