Great Britain vs Victoria sandwich

Great Britain and Victoria sandwich both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
Victoria sandwich	Yes	No	No	No

Great Britain (noun)	Victoria sandwich (noun)
an island comprising England and Scotland and Wales	a cake consisting of two layers of sponge cake with a jelly filling in between
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