drop curtain vs curtain

drop curtain and curtain both are nouns.

Word	Noun	Adjective	Verb	Adverb
drop curtain	Yes	No	No	No
curtain	Yes	No	Yes	No

As nouns, curtain is a hypernym of drop curtain; that is, curtain is a word with a broader meaning than drop curtain:

drop curtain: a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery
curtain: hanging cloth used as a blind (especially for a window)

Other hypernyms of drop curtain include drape, drapery, mantle, pall.

drop curtain (noun)	curtain (noun)
a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery	hanging cloth used as a blind (especially for a window)
	any barrier to communication or vision

drop curtain (verb)	curtain (verb)
	provide with drapery