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The word "prolificacy" is correct and usable in written English.
It can be used to refer to someone's verbal or artistic productivity, especially when they produce a large number of works in a short period of time. For example, "His prolificacy was amazing; he wrote three novels in only two years."
Exact(35)
Burbank's prolificacy grew out of a creativity that could seem almost shameless.
Such prolificacy shows that Reagan was industrious, adaptable, quick to learn, and slow to grouch; more important, it reminds us what an ideal creature he was in the age — Jurassically old and lost to us — of the B movie.
Sadly, Rebeck, who owes more than just her prolificacy to the years she spent writing for TV crime dramas, can't quite bring herself to bite the hand that's fed her, loading the play — like a "Law & Order" episode — with so many eleventh-hour plot and tone reversals that she almost gets away with not having fresh insight into such well-trod satirical territory.
Among those who have paid attention the whole way, he may be best and most properly known for his stamina as a performer and his enduring prolificacy as a songwriter.
To assess Graves's over-all accomplishment is a formidable undertaking, given both his prolificacy (more than a hundred books) and the breadth of his erudition (deep linguistic and historical research into a host of cultures, modern and ancient).
We see this in his excesses — not merely the prolificacy of his output, but the outrageousness of his characters' offenses, their deeds, appetites, shames and confessions.
She received several call-outs from the stage, highlighting her prolificacy and the popularity of her HBO series, "Girls".
Known for his prolificacy, Mr. Smith has filled his Manhattan studio with stacks and stacks of paintings and collages.
Delaunay's impressive prolificacy is still being sorted out.
This is John le Carré's 23rd novel, and neither prolificacy nor age (he's 81) has diminished his legendary and sometimes startling gift for mimicry.
Mr. Hitchens's erudition, wit and prolificacy were taken for granted by the five participants: Katha Pollitt and Victor Navasky, his erstwhile colleagues at The Nation magazine; Graydon Carter, the editor of Vanity Fair; and George Packer, a staff writer for The New Yorker.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com