U.K. vs ropy

U.K. is a noun but ropy is not a noun.

Word	Noun	Adjective	Verb	Adverb
U.K.	Yes	No	No	No
ropy	No	Yes	No	No

U.K. (noun)	ropy (noun)
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

U.K. (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