electronic computer vs computer

electronic computer and computer both are nouns.

Word	Noun	Adjective	Verb	Adverb
electronic computer	Yes	No	No	No
computer	Yes	No	No	No

As nouns, electronic computer and computer are synonyms defined as:

electronic computer and computer: a machine for performing calculations automatically

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

electronic computer (noun)	computer (noun)
a machine for performing calculations automatically	a machine for performing calculations automatically
	an expert at calculation (or at operating calculating machines)