Discreet means careful and private. Discrete means separate, not continuous. A discreet warning. Discrete data points. Diction as a set is in word choice.
Quiet versus separate
If someone is being tactful, use discreet. If items are distinct chunks, use discrete. Math and science passages love the second one.
Conscience versus conscious is another look-alike, in conscience versus conscious. Then versus than is in then versus than. Grammar overall is in ACT grammar rules.
The bottom line
Tactful: discreet. Separate: discrete.
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