prompter's box vs proscenium

prompter's box and proscenium both are nouns.

Word	Noun	Adjective	Verb	Adverb
prompter's box	Yes	No	No	No
proscenium	Yes	No	No	No

prompter's box (noun)	proscenium (noun)
a booth projecting above the floor in the front of a stage where the prompter sits; opens toward the performers on stage	the wall that separates the stage from the auditorium in a modern theater
	the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain)