United Kingdom of Great Britain and Northern Ireland vs bubble and squeak

United Kingdom of Great Britain and Northern Ireland and bubble and squeak both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
bubble and squeak	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (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