USAF vs Air Combat Command

USAF and Air Combat Command both are nouns.

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

USAF (noun)	Air Combat Command (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