closet drama vs drama

closet drama and drama both are nouns.

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

As nouns, drama is a hypernym of closet drama; that is, drama is a word with a broader meaning than closet drama:

closet drama (noun)	drama (noun)
drama more suitable for reading than for performing	the quality of being arresting or highly emotional
	the literary genre of works intended for the theater
	a dramatic work intended for performance by actors on a stage
	an episode that is turbulent or highly emotional