Which word describes a rhythmic flow of a sequence of sounds or words?

The term that best describes a rhythmic flow of a sequence of sounds or words is "cadence." Cadence refers to the rhythm or measured flow of a sequence, often associated with spoken language, poetry, or music. It captures the rise and fall, the pauses, and the timing that give a sense of movement and structure to words.

In contrast, "harmony" pertains to the combination of different musical notes played or sung simultaneously, which is more about the relationships between multiple sounds rather than their rhythmic presentation. "Rhyme" focuses specifically on the similarity of sounds at the end of words, creating patterns in poetry, but does not encompass the full rhythmic aspect as cadence does. "Melody" refers to a sequence of notes that are perceived as a single entity, often forming the main theme in music, but it does not directly address rhythm in the context of the arrangement of sounds or words. Therefore, cadence is the most appropriate term for describing a rhythmic flow.