upper balcony vs second balcony

upper balcony and second balcony both are nouns.

Word	Noun	Adjective	Verb	Adverb
upper balcony	Yes	No	No	No
second balcony	Yes	No	No	No

As nouns, upper balcony and second balcony are synonyms defined as:

upper balcony and second balcony: rearmost or uppermost area in the balcony containing the least expensive seats

Other synonyms of upper balcony include family circle, peanut gallery.

upper balcony (noun)	second balcony (noun)
rearmost or uppermost area in the balcony containing the least expensive seats	rearmost or uppermost area in the balcony containing the least expensive seats