boo vs warning

boo

noun
  • A derisive shout made to indicate disapproval. 

  • Cannabis. 

  • A close acquaintance or significant other. 

  • A tail feather from an ostrich. 

intj
  • Used ironically in a situation where one had the opportunity to scare someone by speaking suddenly. 

  • A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly. 

  • An exclamation used by a member or many members of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred. 

verb
  • To shout extended boos derisively. 

  • To shout extended boos at, as a form of derision. 

  • To defecate. 

warning

noun
  • Something spoken or written that is intended to warn. 

  • The action of the verb warn; an instance of warning someone. 

intj
  • Used to warn of danger in signs and notices. 

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