United Kingdom of Great Britain and Northern Ireland vs tea biscuit

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

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

United Kingdom of Great Britain and Northern Ireland (noun)	tea biscuit (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	flat semisweet cookie or biscuit usually served with tea