duplication vs copying

duplication and copying both are nouns.

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

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

duplication: the act of copying or making a duplicate (or duplicates) of something
copying: an act of copying

duplication (noun)	copying (noun)
the act of copying or making a duplicate (or duplicates) of something	an act of copying
a copy that corresponds to an original exactly