White noise amplitude is described by total power or spectrum level (LPC).

Evidence

Unlike a pure tone, which is characterized by amplitude and frequency, we can characterize white noise with a single parameter describing its amplitude. We more commonly describe the amplitude of white noise by one of two primary metrics: the total power (dB SPL) and the spectrum level (dB SPL). … The spectrum level reflects the power within a 1-Hz band and is also commonly referred to as the level per cycle (LPC) in the field of audiology. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 410

Categorization

• DEFINE: Defines the two amplitude metrics for noise: total power and spectrum level/LPC per 1-Hz band.