Great Britain vs slate club

Great Britain and slate club both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
slate club	Yes	No	No	No

Great Britain (noun)	slate club (noun)
an island comprising England and Scotland and Wales	a group of people who save money in a common fund for a specific purpose (usually distributed at Christmas)
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