Great Britain vs Norfolk wherry

Great Britain and Norfolk wherry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
Norfolk wherry	Yes	No	No	No

Great Britain (noun)	Norfolk wherry (noun)
an island comprising England and Scotland and Wales	sailing barge used especially in East Anglia
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