ADP system vs automatic data processing system

ADP system and automatic data processing system both are nouns.

Word	Noun	Adjective	Verb	Adverb
ADP system	Yes	No	No	No
automatic data processing system	Yes	No	No	No

As nouns, ADP system and automatic data processing system are synonyms defined as:

ADP system and automatic data processing system: a system of one or more computers and associated software with common storage

Other synonyms of ADP system include ADPS, computer system, computing system.

ADP system (noun)	automatic data processing system (noun)
a system of one or more computers and associated software with common storage	a system of one or more computers and associated software with common storage