adding

As verbs the difference between add and adding

is that add is to join or unite, as one thing to another, or as several particulars, so as to increase the number, augment the quantity, or enlarge the magnitude, or so as to form into one aggregate. Hence: To sum up; to put together mentally while adding is present participle of lang=en.

As a noun add

is an additional enemy that joined the fight after the primary target.

As a verb adding

is present participle of lang=en.

As an adjective additional is

supplemental or added to something.

As a noun additional is

something added.