The Collaborative International Dictionary of English v.0.48:

Stutter \Stut"ter\, v. t. & i. [imp. & p. p. Stuttered; p. pr.
   & vb. n. Stuttering.] [Freq. of stut, OE. stoten; probably
   of Dutch or Low German origin; cf. D. & LG. stotteren, G.
   stottern, D. stooten to push, to strike; akin to G. stossen,
   Icel. stauta, Sw. st["o]ta, Dan. st["o]de, Goth. stautan, L.
   tundere, Skr. tud to thrust. Cf. Contuse, Obtuse.]
   To hesitate or stumble in uttering words; to speak with
   spasmodic repetition or pauses; to stammer.
   [1913 Webster]

         Trembling, stuttering, calling for his confessor.
                                                  --Macaulay.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stutter \Stut"ter\, n.
   1. The act of stuttering; a stammer. See Stammer, and
      Stuttering.
      [1913 Webster]

   2. One who stutters; a stammerer. [Obs.] --Bacon.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stutter
    n 1: a speech disorder involving hesitations and involuntary
         repetitions of certain sounds [syn: stammer, stutter]
    v 1: speak haltingly; "The speaker faltered when he saw his
         opponent enter the room" [syn: bumble, stutter,
         stammer, falter]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "stutter":
   balbuties, dysphemia, falter, faltering, halt, hammer, haw, hem,
   hem and haw, hesitate, hesitation, hum, hum and haw, mammer,
   palilalia, stammer, stammering, stumble, stuttering, traulism