add vs addition

add is not a noun while addition is a noun.

Word	Noun	Adjective	Verb	Adverb
add	No	No	Yes	No
addition	Yes	No	No	No

add (noun)	addition (noun)
	the arithmetic operation of summing; calculating the sum of two or more numbers
	the act of adding one thing to another
	a component that is added to something to improve it
	a suburban area laid out in streets and lots for a future residential area
	something added to what you already have
	a quantity that is added

add (verb)	addition (verb)
make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of
make an addition by combining numbers
determine the sum of
state or say further
bestow a quality on
constitute an addition