reduplicate vs duplicate

reduplicate is not a noun while duplicate is a noun.

Word	Noun	Adjective	Verb	Adverb
reduplicate	No	No	Yes	No
duplicate	Yes	Yes	Yes	No

As verbs, reduplicate and duplicate are synonyms defined as:

Other synonyms of reduplicate include double, repeat, replicate.

As verbs, duplicate is a hypernym of reduplicate; that is, duplicate is a word with a broader meaning than reduplicate:

Other hypernyms of reduplicate include double, reduplicate, repeat, replicate.

reduplicate (noun)	duplicate (noun)
	a copy that corresponds to an original exactly
	something additional of the same kind

reduplicate (adjective)	duplicate (adjective)
	being two identical
	identically copied from an original

reduplicate (verb)	duplicate (verb)
make or do or perform again	increase twofold
form by reduplication	make or do or perform again
	make a duplicate or duplicates of
	duplicate or match