proscenium vs proscenium wall

proscenium and proscenium wall both are nouns.

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

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

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

proscenium (noun)	proscenium wall (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)