episode vs broadcast

episode and broadcast both are nouns.

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

As nouns, broadcast is a hypernym of episode; that is, broadcast is a word with a broader meaning than episode:

Other hypernyms of episode include program, programme.

episode (noun)	broadcast (noun)
film consisting of a succession of related shots that develop a given subject in a movie	message that is transmitted by radio or television
a part of a broadcast serial	a radio or television show
a brief section of a literary or dramatic work that forms part of a connected series
a happening that is distinctive in a series of related events

episode (verb)	broadcast (verb)
	cause to become widely known
	broadcast over the airwaves, as in radio or television
	sow over a wide area, especially by hand