broadcaster vs news commentator

broadcaster

noun
  • A piece of equipment used to transmit data over a computer network. 

  • An organization or station that engages in the activity of such broadcasting. 

  • A machine used to broadcast or spread seeds, fertilizer, etc. 

  • A piece of equipment used to transmit audio and/or video content, or messages, to be received by radios or televisions, over the internet, etc. 

  • A person whose job it is to effect such broadcasts; specifically, one who presents radio or television programmes (especially documentaries or news programmes); a presenter. 

news commentator

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