Tremor = rhythmic fine (slight or small movements) or a body part, eg hand.
Twitching = not a medical term but would usually describe a tic. Tic = sudden, repetitive, brief physical movements of sound a person makes that the person has some, but limited control over. This means they can suppress it for a while but usually not indefinitely. Repetitive does not mean occurring in the same short time period (all though some tics may include a short period of a repetitive movement such as beating the chest a few times in a row), but over a longer period of weeks, months or years.
Spasm = sudden uncontrolled contraction of a group of muscles. Often painful, but not always.
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