pretend vs warn

pretend

verb
  • To make oneself appear to do or be doing something; to engage in make-believe. 

  • To claim, to allege, especially when falsely or as a form of deliberate deception. 

  • To feign, affect (a state, quality, etc.). 

  • To lay claim to (an ability, status, advantage, etc.). (originally used without to) 

adj
  • Not really what it is represented as being; imaginary, feigned. 

noun
  • the act of engaging in pretend play. 

warn

verb
  • To make (someone) aware of impending danger, evil, etc. 

  • To notify or inform (someone, about something). 

  • To caution or admonish (someone) against unwise or unacceptable behaviour. 

  • To give warning. 

  • To summon (someone) to or inform of a formal meeting or duty. 

  • To advise or order to go or stay away. 

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