Great Britain vs Christmas cake

Great Britain and Christmas cake both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
Christmas cake	Yes	No	No	No

Great Britain (noun)	Christmas cake (noun)
an island comprising England and Scotland and Wales	a rich fruitcake (usually covered with icing and marzipan) and eaten at Christmas
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