Great Britain vs tavern keeper

Great Britain and tavern keeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
tavern keeper	Yes	No	No	No

Great Britain (noun)	tavern keeper (noun)
an island comprising England and Scotland and Wales	the keeper of a public house
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