whitefish vs United Kingdom of Great Britain and Northern Ireland

whitefish and United Kingdom of Great Britain and Northern Ireland both are nouns.

Word	Noun	Adjective	Verb	Adverb
whitefish	Yes	No	No	No
United Kingdom of Great Britain and Northern Ireland	Yes	No	No	No

whitefish (noun)	United Kingdom of Great Britain and Northern Ireland (noun)
silvery herring-like freshwater food fish of cold lakes of the Northern Hemisphere	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
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