While writing a blog, a question struck my mind:
What do we call to the person who can write many words, say 3000-5000 words, in a day?
I tried to google the answer but failed. Is there any word in English for such a strong writer?
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Assuming that the number you gave represents an unusually high output (and that's what you're trying to describe), then they could be said to be prolific:
marked by abundant inventiveness or productivity · a prolific composer
producing a large amount of something