episode vs drama

episode and drama both are nouns.

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

As nouns, drama is a hyponym of episode; that is, drama is a word with a more specific, narrower meaning than episode:

Other hyponyms of episode include dramatic event, chapter, idyll.

episode (noun)	drama (noun)
film consisting of a succession of related shots that develop a given subject in a movie	the quality of being arresting or highly emotional
a part of a broadcast serial	the literary genre of works intended for the theater
a brief section of a literary or dramatic work that forms part of a connected series	a dramatic work intended for performance by actors on a stage
a happening that is distinctive in a series of related events	an episode that is turbulent or highly emotional