To determine the odd one out from the provided group of words, we should first understand the meanings and relationships between the words:
- din: a loud, unpleasant, and prolonged noise.
- cacophony: a harsh, discordant mixture of sounds.
- racket: a loud unpleasant noise; a din.
- cadence: a modulation or inflection of the voice.
Upon examining the meanings:
- Din, cacophony, and racket all describe types of loud or harsh noises.
- Cadence refers to a rhythmic flow of sounds in language or music, which is different in context because it does not imply unpleasantness or noise.
Therefore, the odd one out is:
cadence