bubble and squeak vs Great Britain

bubble and squeak and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
bubble and squeak	Yes	No	No	No
Great Britain	Yes	No	No	No

bubble and squeak (noun)	Great Britain (noun)
leftover cabbage fried with cooked potatoes and sometimes meat	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