multiple vs quadruple

multiple and quadruple both are nouns.

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

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

Other hyponyms of multiple include double, triple, lcm, least common multiple, lowest common multiple.

multiple (noun)	quadruple (noun)
the product of a quantity by an integer	a quantity that is four times as great as another
	a set of four similar things considered as a unit

multiple (adjective)	quadruple (adjective)
having or involving or consisting of more than one part or entity or individual	four times as great or many
	having four units or components

multiple (verb)	quadruple (verb)
	increase fourfold