episode vs podcast

episode

noun
  • An instalment of a drama told in parts, as in a TV series. 

  • An incident, action, or time period standing out by itself, but more or less connected with a complete series of events. 

podcast

noun
  • An individual episode of such a programme. 

  • 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. 

verb
  • 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. 

  • 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. 

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