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How do stuttering and stammering refer to the same speech disorder?

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Uncover the science behind the transformation of sounds into speech — speech Speech is the faculty of producing articulated sounds, which, when blended together, form language.

Stuttering and stammering are two terms used to describe the same speech disorder, which is academically known as dysphemia. The primary difference between the two is regional: "stuttering" is the term typically used in the United States, while "stammering" is the common name for the same condition in the United Kingdom.1

Both terms refer to a disorder characterized by involuntary repetitions of sounds or syllables, as well as the intermittent blocking or prolongation of sounds, syllables, and words. These disruptions interfere with the natural rhythm and fluency of speech. While the terms are often used interchangeably to describe this disfluency, they are both symptomatic labels that describe the audible result of the disorder rather than its underlying physiological or psychological cause.231