gemination vs duplication

gemination and duplication both are nouns.

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

As nouns, gemination and duplication are synonyms defined as:

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

gemination (noun)	duplication (noun)
the act of copying or making a duplicate (or duplicates) of something	the act of copying or making a duplicate (or duplicates) of something
the doubling of a word or phrase (as for rhetorical effect)	a copy that corresponds to an original exactly