central processing unit vs computing

central processing unit and computing both are nouns.

Word	Noun	Adjective	Verb	Adverb
central processing unit	Yes	No	No	No
computing	Yes	No	No	No

central processing unit (noun)	computing (noun)
(computer science) the part of a computer (a microprocessor chip) that does most of the data processing	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