Great Britain vs ropy

Great Britain is a noun but ropy is not a noun.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
ropy	No	Yes	No	No

Great Britain (noun)	ropy (noun)
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

Great Britain (adjective)	ropy (adjective)
	of or resembling rope (or ropes) in being long and strong
	(British informal) very poor in quality
	forming viscous or glutinous threads