command processing overhead time vs computing

command processing overhead time and computing both are nouns.

Word	Noun	Adjective	Verb	Adverb
command processing overhead time	Yes	No	No	No
computing	Yes	No	No	No

command processing overhead time (noun)	computing (noun)
(computer science) the processing time required by a device prior to the execution of a command	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