atrium

As nouns the difference between mezzanine and atrium

is that mezzanine is a balcony in an auditorium while atrium is a central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.

As an adjective mezzanine

is fulfilling an intermediate or secondary function.

As a noun atrium is

atrium (a square hall lit from above).

Vestbule is likely misspelled.

Vestbule has no English definition.

As a noun atrium is

a central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.

As nouns the difference between lobby and atrium

is that lobby is an entryway or reception area; vestibule; passageway; corridor while atrium is a central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.

As a verb lobby

is to attempt to influence (a public official or decision-maker) in favor of a specific opinion or cause.

In architecture terms the difference between vestibule and atrium

is that vestibule is a passage, hall or room, such as a lobby, between the outer door and the interior of a building while atrium is a square hall lit by daylight from above, into which rooms open at one or more levels.

As a noun atrium

is atrium (a square hall lit from above).

As an adjective visceroatrial is

of or pertaining to the viscera of the atrium of the heart.

As a noun atrium

is atrium (a square hall lit from above).

As an adjective sinoatrial is

(anatomy) relating to the venous sinus and the right atrium of the heart.

As a noun atrium

is atrium (a square hall lit from above).

As an adjective cavoatrial is

of or pertaining to both the vena cava and the atrium of the heart.