hard shoulder vs Britain

hard shoulder and Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
hard shoulder	Yes	No	No	No
Britain	Yes	No	No	No

hard shoulder (noun)	Britain (noun)
a paved strip beside a motorway (for stopping in emergencies)	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