Resolution of an ADC:
Resolution of an ADC is defined as the smallest voltage increment corresponding to a 1 bit LSB change.It is the smallest analog voltage an ADC can resolve.
Accuracy of an ADC:
Accuracy of an ADC determines how close the actual digital output is to the theoretically expected digital output for a given analog input. The accuracy of an ADC is a function of its internal circuitry and noise from the external sources connected to the ADC.