One is a subtype of the other. Would you insist on using "radio broadcast" instead of "morning show"? Aside from that, a podcast is still a podcast regardless

One is a subtype of the other. Would you insist on using "radio broadcast" instead of "morning show"? Aside from that, a podcast is still a podcast regardless of whether you downloaded it, streamed it, or distributed it over media like flash drives and compact discs. That's why it's useful to have a new noun.