Britain vs bubble and squeak

Britain and bubble and squeak both are nouns.

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

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