gemination vs copying

gemination and copying both are nouns.

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

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

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

gemination (noun)	copying (noun)
the act of copying or making a duplicate (or duplicates) of something	an act of copying
the doubling of a word or phrase (as for rhetorical effect)