Synonyms for Shudder (same or very similar meaning)
WordNet sense 1 (an almost pleasurable sensation of fright):
chill, frisson, quiver, shiver, thrill, tingleWordNet sense 2 (tremble convulsively, as from fear or excitement):
throbWordNet sense 3 (an involuntary vibration (as if from illness or fear)):
tremorFrom the ODE community, based on WordNetadd/edit