notification vs voicemail

notification

noun
  • A text message on a cell phone. 

  • The act of notifying. 

  • A specific piece of information that serves to notify. 

voicemail

noun
  • A computerized interactive system for storing, processing and reproducing verbal messages left through a conventional telephone network. 

  • An individual message on such a system. 

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