in series vs computing

in series is not a noun while computing is a noun.

Word	Noun	Adjective	Verb	Adverb
in series	No	Yes	No	No
computing	Yes	No	No	No

in series (noun)	computing (noun)
	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

in series (adjective)	computing (adjective)
of or relating to the sequential performance of multiple operations