counterpart vs duplication

counterpart and duplication both are nouns.

Word	Noun	Adjective	Verb	Adverb
counterpart	Yes	No	No	No
duplication	Yes	No	No	No

As nouns, duplication is a hypernym of counterpart; that is, duplication is a word with a broader meaning than counterpart:

Other hypernyms of counterpart include duplicate.

counterpart (noun)	duplication (noun)
a duplicate copy	the act of copying or making a duplicate (or duplicates) of something
a person or thing having the same function or characteristics as another	a copy that corresponds to an original exactly