computing machine vs electronic computer

computing machine and electronic computer both are nouns.

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

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

computing machine and electronic computer: a machine for performing calculations automatically

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

computing machine (noun)	electronic computer (noun)
a machine for performing calculations automatically	a machine for performing calculations automatically