Great Britain vs NATO

Great Britain and NATO both are nouns.

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

Great Britain (noun)	NATO (noun)
an island comprising England and Scotland and Wales	an international organization created in 1949 by the North Atlantic Treaty for purposes of collective security
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