afternoon tea vs Great Britain

afternoon tea and Great Britain both are nouns.

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

afternoon tea (noun)	Great Britain (noun)
a light midafternoon meal of tea and sandwiches or cakes	an island comprising England and Scotland and Wales
	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