whitefish vs Great Britain

whitefish and Great Britain both are nouns.

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

whitefish (noun)	Great Britain (noun)
silvery herring-like freshwater food fish of cold lakes of the Northern Hemisphere	an island comprising England and Scotland and Wales
flesh of salmon-like or trout-like cold-water 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
any market fish--edible saltwater fish or shellfish--except herring