Page "Shot noise" Paragraph 27

Shot noise is distinct from voltage and current fluctuations expected in thermal equilibrium ; this occurs without any applied DC voltage or current flowing.

These fluctuations are known as Johnson – Nyquist noise or thermal noise and increase in proportion to the Kelvin temperature of any resistive component.

However both are instances of white noise and thus cannot be distinguished simply by observing them even though their origins are quite dissimilar.