Britain vs arterial road

Britain and arterial road both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britain	Yes	No	No	No
arterial road	Yes	No	No	No

Britain (noun)	arterial road (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 major or main route