Britain vs British Cabinet

Britain and British Cabinet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britain	Yes	No	No	No
British Cabinet	Yes	No	No	No

Britain (noun)	British Cabinet (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	the senior ministers of the British government