Great Britain vs Victoria plum

Great Britain and Victoria plum both are nouns.

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

Great Britain (noun)	Victoria plum (noun)
an island comprising England and Scotland and Wales	a large red plum served as dessert
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