podcast vs radiotelephone

podcast

verb
  • To deliver (information) in the form of a programme, especially an audio programme, over the Internet on a regular basis for playback on computers or portable devices such as mobile phones. 

  • To deliver a programme, especially an audio programme, over the Internet on a regular basis for playback on computers or portable devices such as mobile phones. 

noun
  • A programme, especially an audio programme, produced on a regular basis, delivered over the Internet in a compressed digital format and designed for playback on computers or portable devices such as mobile phones. 

  • An individual episode of such a programme. 

radiotelephone

verb
  • To communicate via such a device 

noun
  • a device that allows two-way communication via radio 

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