computing machine vs computing device

computing machine and computing device both are nouns.

Word	Noun	Adjective	Verb	Adverb
computing machine	Yes	No	No	No
computing device	Yes	No	No	No

As nouns, computing machine and computing device are synonyms defined as:

computing machine and computing device: a machine for performing calculations automatically

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

computing machine (noun)	computing device (noun)
a machine for performing calculations automatically	a machine for performing calculations automatically