UK vs whitefish

UK and whitefish both are nouns.

Word	Noun	Adjective	Verb	Adverb
UK	Yes	No	No	No
whitefish	Yes	No	No	No

UK (noun)	whitefish (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	silvery herring-like freshwater food fish of cold lakes of the Northern Hemisphere
	flesh of salmon-like or trout-like cold-water fish of cold lakes of the Northern Hemisphere
	any market fish--edible saltwater fish or shellfish--except herring