multiply vs quadruple

multiply is not a noun while quadruple is a noun.

Word	Noun	Adjective	Verb	Adverb
multiply	No	No	Yes	Yes
quadruple	Yes	Yes	Yes	No

As verbs, quadruple is a hyponym of multiply; that is, quadruple is a word with a more specific, narrower meaning than multiply:

Other hyponyms of multiply include double, duplicate, treble, triple, quintuple, proliferate.

multiply (noun)	quadruple (noun)
	a quantity that is four times as great as another
	a set of four similar things considered as a unit

multiply (adjective)	quadruple (adjective)
	four times as great or many
	having four units or components

multiply (verb)	quadruple (verb)
have young (animals) or reproduce (organisms)	increase fourfold
have offspring or produce more individuals of a given animal or plant
combine or increase by multiplication
make multiple copies of
combine by multiplication

multiply (adverb)	quadruple (adverb)
in several ways; in a multiple manner