sip vs snarf

sip

verb
  • To consume slowly. 

  • To drink slowly, small mouthfuls at a time. 

  • To drink a small quantity. 

  • To taste the liquor of; to drink out of. 

noun
  • A small mouthful of drink 

snarf

verb
  • To eat or consume greedily. 

  • To take something by dubious means, but without the connotations of stealing; to take something without regard to etiquette. 

  • To slurp (computing slang sense); to load in entirety; to copy as a whole. 

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