duplicate vs repeat

duplicate and repeat both are nouns.

Word	Noun	Adjective	Verb	Adverb
duplicate	Yes	Yes	Yes	No
repeat	Yes	No	Yes	No

As verbs, duplicate and repeat are synonyms defined as:

Other synonyms of duplicate include double, reduplicate, replicate.

duplicate (noun)	repeat (noun)
a copy that corresponds to an original exactly	an event that repeats
something additional of the same kind

duplicate (adjective)	repeat (adjective)
being two identical
identically copied from an original

duplicate (verb)	repeat (verb)
increase twofold	happen or occur again
make or do or perform again	to say, state, or perform again
make a duplicate or duplicates of	to say again or imitate
duplicate or match	make or do or perform again
	repeat an earlier theme of a composition
	do over