concatenate vs computing

concatenate is not a noun while computing is a noun.

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

concatenate (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

concatenate (verb)	computing (verb)
add by linking or joining so as to form a chain or series
combine two strings to form a single one