mezzanine vs balcony

mezzanine and balcony both are nouns.

Word	Noun	Adjective	Verb	Adverb
mezzanine	Yes	No	No	No
balcony	Yes	No	No	No

As nouns, balcony is a hypernym of mezzanine; that is, balcony is a word with a broader meaning than mezzanine:

mezzanine: first or lowest balcony
balcony: an upper floor projecting from the rear over the main floor in an auditorium

mezzanine (noun)	balcony (noun)
intermediate floor just above the ground floor	a platform projecting from the wall of a building and surrounded by a balustrade or railing or parapet
first or lowest balcony	an upper floor projecting from the rear over the main floor in an auditorium