public house vs Great Britain

public house and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
public house	Yes	No	No	No
Great Britain	Yes	No	No	No

public house (noun)	Great Britain (noun)
tavern consisting of a building with a bar and public rooms; often provides light meals	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