flinch vs hyperkinesis

flinch

noun
  • A reflexive jerking away. 

  • The slipping of the foot from a ball, when attempting to give a tight croquet. 

verb
  • To make a sudden, involuntary movement in response to a (usually negative) stimulus; to cringe. 

  • To dodge (a question), to avoid an unpleasant task or duty 

  • To let the foot slip from a ball, when attempting to give a tight croquet. 

hyperkinesis

noun
  • Abnormally increased and sometimes uncontrollable activity or muscular movements. 

  • A condition especially of childhood characterized by hyperactivity. 

How often have the words flinch and hyperkinesis occurred in a corpus of books? (source: Google Ngram Viewer )