hard shoulder vs Great Britain

hard shoulder and Great Britain both are nouns.

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

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