In uncountable|lang=en terms the difference between scorn and sarcasm
is that
scorn is (uncountable) contempt or disdain while
sarcasm is (uncountable) a sharp form of humor, intended to hurt, that is marked by mocking with irony, sometimes conveyed in speech with vocal over-emphasis insincerely saying something which is the opposite of one's intended meaning, often to emphasize how unbelievable or unlikely it sounds if taken literally, thereby illustrating the obvious nature of one's intended meaning.
In countable|lang=en terms the difference between scorn and sarcasm
is that
scorn is (countable) an object of disdain, contempt, or derision while
sarcasm is (countable) an act of sarcasm.
As nouns the difference between scorn and sarcasm
is that
scorn is (uncountable) contempt or disdain while
sarcasm is (uncountable) a sharp form of humor, intended to hurt, that is marked by mocking with irony, sometimes conveyed in speech with vocal over-emphasis insincerely saying something which is the opposite of one's intended meaning, often to emphasize how unbelievable or unlikely it sounds if taken literally, thereby illustrating the obvious nature of one's intended meaning.
As a verb scorn
is to feel or display contempt or disdain for something or somebody; to despise.