atrium

In architecture terms the difference between porch and atrium

is that porch is a covered and enclosed entrance to a building, whether taken from the interior, and forming a sort of vestibule within the main wall, or projecting without and with a separate roof while atrium is a square hall lit by daylight from above, into which rooms open at one or more levels.

As nouns the difference between atrium and forecourt

is that atrium is a central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings while forecourt is the area in front of a petrol station where the petrol pumps are situated.

As nouns the difference between foyer and atrium

is that foyer is a lobby, corridor, or waiting room, used in a hotel, theater, etc 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.

In architecture terms the difference between atrium and site

is that atrium is a square hall lit by daylight from above, into which rooms open at one or more levels while site is to situate or place a building.

As a verb site is

to situate or place a building.

As nouns the difference between atrium and peristyle

is that atrium is a central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings while peristyle is colonnade surrounding a courtyard, temple, etc.

As nouns the difference between alveoli and atrium

is that alveoli is (alveolus) while atrium is atrium (a square hall lit from above).

As nouns the difference between atrium and natrium

is that atrium is atrium (a square hall lit from above) while natrium is sodium (symbol: na).

As nouns the difference between aprium and atrium

is that aprium is a plum-apricot cross, which features characteristics of both, (a pluot 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.

In architecture terms the difference between atrium and narthex

is that atrium is a square hall lit by daylight from above, into which rooms open at one or more levels while narthex is a western vestibule leading to the nave in some (especially Orthodox) Christian churches.