announce vs inform

announce

verb
  • to pronounce; to declare by judicial sentence 

  • to give public notice, especially for the first time; to make known 

inform

verb
  • To act as an informer; denounce. 

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

  • To communicate knowledge to. 

  • To impart information or knowledge. 

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

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