North Atlantic Treaty Organization vs NAC

North Atlantic Treaty Organization and NAC both are nouns.

Word	Noun	Adjective	Verb	Adverb
North Atlantic Treaty Organization	Yes	No	No	No
NAC	Yes	No	No	No

North Atlantic Treaty Organization (noun)	NAC (noun)
an international organization created in 1949 by the North Atlantic Treaty for purposes of collective security	a council consisting of permanent representatives of all the member countries of NATO; has political authority and powers of decision