Nouns

(n)paroxysm, fit, convulsiona sudden uncontrollable attack“a paroxysm of giggling”, “a fit of coughing”, “convulsions of laughter”
(n)convulsionviolent uncontrollable contractions of muscles
(n)convulsion, turmoil, upheavala violent disturbance“the convulsions of the stock market”
(n)convulsiona physical disturbance such as an earthquake or upheaval