proscenium wall vs proscenium

proscenium wall and proscenium both are nouns.

Word	Noun	Adjective	Verb	Adverb
proscenium wall	Yes	No	No	No
proscenium	Yes	No	No	No

As nouns, proscenium wall and proscenium are synonyms defined as:

proscenium wall and proscenium: the wall that separates the stage from the auditorium in a modern theater

proscenium wall (noun)	proscenium (noun)
the wall that separates the stage from the auditorium in a modern theater	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)