threat vs warning

threat

noun
  • An expression of intent to injure or punish another. 

  • A person or object that is regarded as a danger; a menace. 

  • An indication of potential or imminent danger. 

verb
  • To press; urge; compel. 

  • To use threats; act or speak menacingly; threaten. 

warning

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

  • Something spoken or written that is intended to warn. 

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

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