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While I am not in the business, I would imagine that the screenplay is the original finished creative work, and the script, sometimes called "the shooting script," is what people use on set or on s...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/10311 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/10311 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
While I am not in the business, I would imagine that the screenplay is the original finished creative work, and the script, sometimes called "the shooting script," is what people use on set or on stage to actually film or perform the thing. So the script is the living, working, occasionally minorly changed piece, which might have additional stage directions or lighting notes for people executing the words.