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"productive" is also used as a crossword clue. If that's what you saw, the answer is often fertile (7 letters).
Definitions
Producing useful results or large amounts of something.
Word origin
Borrowed from Late Latin productivus, equivalent to product + -ive.
Used in a sentence
“a productive set”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Getting much done”10 letters
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