twerk vs vellicate

twerk

verb
  • To twitch or jerk. 

  • To move the body in a sexually suggestive twisting or gyrating fashion, especially as a dance. 

noun
  • A fitful movement similar to a twitch or jerk. 

  • A dance involving sexual movements of the hips and buttocks. 

  • An abrupt call, such as that made by the California quail. 

vellicate

verb
  • To twitch or move convulsively. 

  • To touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements. 

  • To tickle, provoking twitching and laughter. 

  • To criticize in a somewhat irritating way; to carp at. 

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