Great Britain vs noblewoman

Great Britain and noblewoman both are nouns.

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

Great Britain (noun)	noblewoman (noun)
an island comprising England and Scotland and Wales	a woman of the peerage in Britain
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