advertisement vs warning

advertisement

noun
  • A public notice. 

  • A commercial solicitation designed to sell some commodity, service or similar. 

  • In gin rummy, the discarding of a card of one's preferred suit so as to mislead the opponent into thinking you do not want it. 

  • A recommendation of a particular product, service or person. 

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 advertisement and warning occurred in a corpus of books? (source: Google Ngram Viewer )