automatic data processing system vs ADP system

automatic data processing system and ADP system both are nouns.

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

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

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

Other synonyms of automatic data processing system include ADPS, computer system, computing system.

automatic data processing system (noun)	ADP 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