Common Market vs Great Britain

Common Market and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Common Market	Yes	No	No	No
Great Britain	Yes	No	No	No

Common Market (noun)	Great Britain (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	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