Which word can describe a dissonant sound?

The term "cacophony" is used to describe a harsh, jarring, and often discordant mixture of sounds, which aligns perfectly with the idea of a dissonant sound. In various contexts, such as music or sound studies, cacophony refers to a variety of noises that clash or lack harmony, creating a sense of chaotic auditory experience.

The other words do not capture the same concept. "Cadence" refers to a rhythmic sequence or flow, often associated with more pleasant, harmonious sound patterns. "Sonic" is a descriptor related to sound in general but does not imply anything about the harmony or dissonance of those sounds. "Serenity" conveys a sense of calmness and peacefulness, which is the opposite of dissonance. Hence, "cacophony" stands out as the term that specifically describes dissonant sound.