podcast vs broadcast

podcast is not a noun while broadcast is a noun.

Word	Noun	Adjective	Verb	Adverb
podcast	No	No	Yes	No
broadcast	Yes	No	Yes	No

As verbs, broadcast is a hypernym of podcast; that is, broadcast is a word with a broader meaning than podcast:

podcast: distribute (multimedia files) over the internet for playback on a mobile device or a personal computer
broadcast: cause to become widely known

podcast (noun)	broadcast (noun)
	message that is transmitted by radio or television
	a radio or television show

podcast (verb)	broadcast (verb)
distribute (multimedia files) over the internet for playback on a mobile device or a personal computer	cause to become widely known
	broadcast over the airwaves, as in radio or television
	sow over a wide area, especially by hand