Stuttering shares many characteristics that are consistent with tic behavior, 1) they are both largely involuntary, 2) both can be anticipated by the person 3) both could be considered a difficulty initiating movement 4) both are associated with decreased dopamine But stuttering is not a tic. Stuttering only occurs during speech and not at rest, whereas a tic occurs either during movement or at rest. That's the fundamental difference between a disfluency and a tic--when it happens. But your point is true, the general population doesn't have a good understanding of what "stuttering" is nor what factors facilitate fluent speech. And more directly to your point there are people within the stuttering community beginning to talk about renaming the disorder. Something like Van Riper's Syndrome or something like that (Named for Charles Van Riper one of the first scientists / clinicians to pioneer stuttering research and stuttering therapy). But, however, even changing the name won't necessary stop people from making wrong assumptions about stuttering when they hear it. C'est la vie, there's no easy answer.