different between twitching vs jerking

English

twitching

twitching (countable and uncountable, plural twitchings)

The motion of something that twitches.
- 1843, The Knickerbocker (volumes 21-22, page 73)
  Your twitchings and jouncings disturb me excessively.
(birdwatching) Compulsive birdwatching by people (twitchers) who travel long distances to see rare species.

twitching (comparative more twitching, superlative most twitching)

jerking

jerking (plural jerkings)

A motion that jerks; a jerk.
- 1973, Oliver Sacks, Awakenings
  The 'movement' was simultaneously emotional and motoric, and essentially autonomous (thus distinguishing it from passive jerkings and other pathology).

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