psellism      stuttering or stammering.
battology excessive repetition of words.
ploce (rhet.) repetition of a phrase.
psittacism meaningless, repetitive speech.
pleonasm redundancy; a redundant word or expression.
gemination duplication; repetition for rhetorical effect.
mussitation motion of the verbal apparatus, forming soundless speech; muttering.
floccilation delirious picking at the bedclothes.