mezzanine vs mezzanine floor

mezzanine and mezzanine floor both are nouns.

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

As nouns, mezzanine and mezzanine floor are synonyms defined as:

mezzanine and mezzanine floor: intermediate floor just above the ground floor

Other synonyms of mezzanine include entresol.

mezzanine (noun)	mezzanine floor (noun)
intermediate floor just above the ground floor	intermediate floor just above the ground floor
first or lowest balcony