ADP system vs ADPS

ADP system and ADPS both are nouns.

Word	Noun	Adjective	Verb	Adverb
ADP system	Yes	No	No	No
ADPS	Yes	No	No	No

As nouns, ADP system and ADPS are synonyms defined as:

ADP system and ADPS: a system of one or more computers and associated software with common storage

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

ADP system (noun)	ADPS (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