sweet Fanny Adams vs Great Britain

sweet Fanny Adams and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet Fanny Adams	Yes	No	No	No
Great Britain	Yes	No	No	No

sweet Fanny Adams (noun)	Great Britain (noun)
little or nothing at all	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