copying vs gemination

copying and gemination both are nouns.

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

As nouns, gemination is a hyponym of copying; that is, gemination is a word with a more specific, narrower meaning than copying:

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

Other hyponyms of copying include duplication, replication, reproduction, imitation.

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