The best replacement for twitching is jerking.

The best alternatives to twitching are rated as following:
★★★★★  jerking
★★★★★  jumping
★★★★  spasms
★★★★  shaking
★★★  baby moving
★★  fasciculation
★★  trembling
★★  muscle spasms
★  muscle twitching
★  tremor
★  ticks
  benign twitching

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

Other search terms related to twitching and their ratings are:
★★★★★ als
★ weakness
You have in mind a companion for twitching and it is not yet here? Propose!



Google Trends

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twitching
jerking
jumping