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"duplicate" is also used as a crossword clue. If that's what you saw, the answer is often copy (4 letters).
Definitions
An exact copy or repeated version of something.
Word origin
Borrowed from Latin duplicātus, perfect passive participle of duplicō, see -ate.
Used in a sentence
“This is a duplicate entry.”
“duplicate whist”
“duplicate Scrabble”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Second copy”9 letters
02“Extra copy”9 letters
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