tremble vs vellication

tremble

noun

  • A shake, quiver, or vibration. 

verb

  • To shake, quiver, or vibrate. 

  • To fear; to be afraid. 

vellication

noun

  • A spasm or twitch. 

  • An instance of tickling or minor irritation. 

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