Great Britain vs tea biscuit

Great Britain and tea biscuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
tea biscuit	Yes	No	No	No

Great Britain (noun)	tea biscuit (noun)
an island comprising England and Scotland and Wales	flat semisweet cookie or biscuit usually served with tea
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