U. S. Air Force vs ACC

U. S. Air Force and ACC both are nouns.

Word	Noun	Adjective	Verb	Adverb
U. S. Air Force	Yes	No	No	No
ACC	Yes	No	No	No

U. S. Air Force (noun)	ACC (noun)
the airforce of the United States of America; the agency that defends the United States through control and exploitation of air and space	a command that is the primary provider of air combat weapon systems to the United States Air Force; operates fighter, bomber, reconnaissance, battle-management, and rescue aircraft