What do we call sounds that are made up of groups of waves with random frequency and intensity?

Sounds made up of groups of waves with random frequency and intensity are referred to as noise. This type of sound does not have a definite pitch or organized frequency structure, which distinguishes it from melodies or harmonies that exhibit predictable patterns and regular frequencies.

Noise can sound chaotic and unstructured; for example, the sound of rain, traffic, or a crowded room typically falls into this category. In contrast, melody implies a sequence of notes that are structured and intentional, while harmony involves multiple notes that are meant to complement each other in a musical context. Chords, similarly, are specific combinations of notes played together in a harmonious way. Thus, noise is uniquely characterized by its lack of organization in terms of frequency and intensity, making it the correct term in this scenario.