computing machine vs computing

computing machine and computing both are nouns.

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

computing machine (noun)	computing (noun)
a machine for performing calculations automatically	the procedure of calculating; determining something by mathematical or logical methods
	the branch of engineering science that studies (with the aid of computers) computable processes and structures