A noise generator is a collection of signals with random amplitudes and frequencies within specific parameters over time. This is the defintion of noise, not a noise generator.
A noise generator creates unpleasant sounds. Unpleasant it may be, but there's a clearer definition here.
A noise generator is a sound module that creates simple, repetitive signals. Noise is only repetitve in its shape, but within that shape noise is random.
A noise generator is a sound module that creates a noise signal. Good job.