The best replacement for myoclonus is clonus.

The best alternatives to myoclonus are rated as following:
★★★★★  clonus
★★★★★  seizure
★★  tic
★★  spasms
★★  fasciculations
★★  chorea
★  dystonia
  tics

Your alternative for myoclonus is not listed? Suggest!
Speaking about myoclonus, one probably shouldn't forget about ataxia.

Other search terms related to myoclonus and their ratings are:
★★★★★ ataxia
★★ essential tremor
★ neuroblastoma
You have in mind a companion for myoclonus and it is not yet here? Propose!



Google Trends

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myoclonus
clonus
seizure