Cluttering has a much more definitive cause and clearer symptoms. Its neurogenic link has been more thoroughly established.

Find information about cluttering in the brochure section of stutteringhelp.org

Stuttering: repetition or prelongation of a sound. W-w-w-water or Sssssso.

Cluttering: repetition of a word, phrase or using filler words: I want, I want, I want some, uh, milk.

For a clear description of both stuttering (which includes both of the above that someone else answered as well as having "blocks") and cluttering, The Stuttering Foundation of America's web site stutteringhelp.org is where to go. Look in the brochure section for an entire brochure on cluttering.

Designed to Sell - 2004 Downsizing and De-Cluttering 6-3 was released on:

USA: 5 September 2009

by thinking clearly about what you want to say when you're writing

Uttering, muttering, fluttering, cluttering, and sputtering.