Britain vs public house

Britain and public house both are nouns.

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

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