information processing system vs electronic computer

information processing system and electronic computer both are nouns.

Word	Noun	Adjective	Verb	Adverb
information processing system	Yes	No	No	No
electronic computer	Yes	No	No	No

As nouns, information processing system and electronic computer are synonyms defined as:

information processing system and electronic computer: a machine for performing calculations automatically

Other synonyms of information processing system include computer, computing device, computing machine, data processor.

information processing system (noun)	electronic computer (noun)
a machine for performing calculations automatically	a machine for performing calculations automatically