closing curtain vs finis

closing curtain and finis both are nouns.

Word	Noun	Adjective	Verb	Adverb
closing curtain	Yes	No	No	No
finis	Yes	No	No	No

As nouns, closing curtain and finis are synonyms defined as:

Other synonyms of closing curtain include close, finale.

closing curtain (noun)	finis (noun)
the concluding part of any performance	the concluding part of any performance
	the temporal end; the concluding time