Noise

Noise is a term for distortions in a signal; there are many different natural causes of noise, e.g. so-called 'thermal' noise, caused by the random motion of electrons in the conductors of a circuit, noise from natural phenomena such as lightning, solar radiation, etc.

Interference is the term for the subset of noise which is not natural, but comes from other electrical systems; e.g. crosstalk, or noise from industrial sources such a car ignitions.