cottage pie vs Great Britain

cottage pie and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
cottage pie	Yes	No	No	No
Great Britain	Yes	No	No	No

cottage pie (noun)	Great Britain (noun)
a dish of minced meat topped with mashed potatoes	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