sweet Fanny Adams vs Britain

sweet Fanny Adams and Britain both are nouns.

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

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