NATO vs NAC

NATO and NAC both are nouns.

Word	Noun	Adjective	Verb	Adverb
NATO	Yes	No	No	No
NAC	Yes	No	No	No

NATO (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