P.A. system vs PA

P.A. system and PA both are nouns.

Word	Noun	Adjective	Verb	Adverb
P.A. system	Yes	No	No	No
PA	Yes	No	No	No

As nouns, P.A. system and PA are synonyms defined as:

P.A. system and PA: an electronic amplification system used as a communication system in public areas

Other synonyms of P.A. system include P.A., PA system, public address system.

P.A. system (noun)	PA (noun)
an electronic amplification system used as a communication system in public areas	an electronic amplification system used as a communication system in public areas
	a Mid-Atlantic state; one of the original 13 colonies, with capital Harrisburg