Air Combat Command vs USAF

Air Combat Command and USAF both are nouns.

Word	Noun	Adjective	Verb	Adverb
Air Combat Command	Yes	No	No	No
USAF	Yes	No	No	No

Air Combat Command (noun)	USAF (noun)
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	the airforce of the United States of America; the agency that defends the United States through control and exploitation of air and space