sponge bag vs Great Britain

sponge bag and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
sponge bag	Yes	No	No	No
Great Britain	Yes	No	No	No

sponge bag (noun)	Great Britain (noun)
a waterproof bag for holding bathrooms items (soap and toothpaste etc.) when you are travelling	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