inform vs warn

inform

verb
  • To communicate knowledge to. 

  • To give form or character to; to inspire (with a given quality); to affect, influence (with a pervading principle, idea etc.). 

  • To act as an informer; denounce. 

  • To impart information or knowledge. 

adj
  • Without regular form; shapeless; ugly; deformed. 

warn

verb
  • 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. 

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

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