Everyone repeats words from time to time, even the most experienced or talented orators. That is why we call a repetition a normal (typical) disfluency. However, when the number of typical disfluencies becomes too much at any point, your communication with others gets disturbed.
In cluttering, repetitions – like those of syllables, words or group of words – may occur frequently. These are symptoms of what is called syntactic cluttering. The repetitions differ from those in stuttering in the sense that they are made in a relaxed manner. Typical for stuttering speakers is that they get stuck in words or sounds. Like in: “A-A-Apple”. Such tense sound repetitions are therefore called stuttering-like disfluencies.