Great Britain vs stone breaker

Great Britain and stone breaker both are nouns.

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

Great Britain (noun)	stone breaker (noun)
an island comprising England and Scotland and Wales	someone who breaks up stone
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