mezzanine floor vs mezzanine

mezzanine floor and mezzanine both are nouns.

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

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

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

Other synonyms of mezzanine floor include entresol.

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