The best replacement for tremors is seizures.

The best alternatives to tremors are rated as following:
★★★★★  seizures
★★★  shaking
★★  shakes
★★  twitches
★  muscle spasms
★  tics
★  parkinsons
★  earthquakes
★  parkinson's
★  fasciculations
★  convulsions
  familial tremors
  parkinson
  spasms
  rigors
  shaking hands
  hand shakes
  shakiness
  hand at rest tremors
  parkinson's disease
  dune
  parkinsons disease

Your alternative for tremors is not listed? Suggest!
Speaking about tremors, one probably shouldn't forget about parkinson's.

Other search terms related to tremors and their ratings are:
★★★★★ parkinson's
★★★★ multiple sclerosis
You have in mind a companion for tremors and it is not yet here? Propose!



Google Trends

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tremors
seizures
shaking