potboy vs Great Britain

potboy and Great Britain both are nouns.

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

potboy (noun)	Great Britain (noun)
a worker in an inn or public house who serves customers and does various chores	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