United Kingdom of Great Britain and Northern Ireland vs high tea

United Kingdom of Great Britain and Northern Ireland and high tea both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No
high tea	Yes	No	No	No

United Kingdom of Great Britain and Northern Ireland (noun)	high tea (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	substantial early evening meal including tea