stone breaker vs Great Britain

stone breaker and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
stone breaker	Yes	No	No	No
Great Britain	Yes	No	No	No

stone breaker (noun)	Great Britain (noun)
someone who breaks up stone	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