hoax vs leg-pull

hoax

noun
  • Anything deliberately intended to deceive or trick. 

verb
  • To deceive (someone) by making them believe something that has been maliciously or mischievously fabricated. 

leg-pull

noun
  • A joke, fib or tease. 

How often have the words hoax and leg-pull occurred in a corpus of books? (source: Google Ngram Viewer )