Highway Code vs Great Britain

Highway Code and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Highway Code	Yes	No	No	No
Great Britain	Yes	No	No	No

Highway Code (noun)	Great Britain (noun)
the code of rules governing the use of public roads	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