Britain vs stockbroker belt

Britain and stockbroker belt both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britain	Yes	No	No	No
stockbroker belt	Yes	No	No	No

Britain (noun)	stockbroker belt (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 wealthy residential suburb