tug vs vellicate

tug

verb
  • To pull or drag with great effort. 

  • To masturbate. 

  • To tow by tugboat. 

  • To pull hard repeatedly. 

noun
  • A dog toy consisting of a rope, often with a knot in it. 

  • A trace, or drawing strap, of a harness. 

  • A tugboat. 

  • An iron hook of a hoisting tub, to which a tackle is affixed. 

  • A sudden powerful pull. 

  • An act of male masturbation. 

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 tug and vellicate occurred in a corpus of books? (source: Google Ngram Viewer )