carriageway vs Great Britain

carriageway and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
carriageway	Yes	No	No	No
Great Britain	Yes	No	No	No

carriageway (noun)	Great Britain (noun)
one of the two sides of a motorway where traffic travels in one direction only usually in two or three lanes	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