quadruplex vs quadruplicate

quadruplex is not a noun while quadruplicate is a noun.

Word	Noun	Adjective	Verb	Adverb
quadruplex	No	Yes	No	No
quadruplicate	Yes	Yes	Yes	No

As adjectives, quadruplex and quadruplicate are synonyms defined as:

Other synonyms of quadruplex include four-fold, fourfold, quadruple.

quadruplex (noun)	quadruplicate (noun)
	any four copies; any of four things that correspond to one another exactly

quadruplex (adjective)	quadruplicate (adjective)
having four units or components	having four units or components

quadruplex (verb)	quadruplicate (verb)
	reproduce fourfold