second balcony vs upper balcony

second balcony and upper balcony both are nouns.

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

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

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

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

second balcony (noun)	upper 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