computing vs backup

computing and backup both are nouns.

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

computing (noun)	backup (noun)
the procedure of calculating; determining something by mathematical or logical methods	the act of providing approval and support
the branch of engineering science that studies (with the aid of computers) computable processes and structures	(computer science) a copy of a file or directory on a separate storage device
	a musical part (vocal or instrumental) that supports or provides background for other musical parts
	someone who takes the place of another (as when things get dangerous or difficult)
	an accumulation caused by clogging or a stoppage