Isn't OP oversimplifying and misrepresenting by saying blocking isn't stuttering just because it's not repetition a repetition of sound? >Stuttering is a speech disorder characterized by repetition of sounds, syllables, or words; prolongation of sounds; and interruptions in speech known as blocks. [What Is Stuttering? | National Institute on Deafness and Other Communication Disorders](https://www.nidcd.nih.gov/health/stuttering)