atrium

As a letter s

is the letter s with a.

As a noun atrium is

atrium (a square hall lit from above).

As nouns the difference between atrium and null

is that atrium is atrium (a square hall lit from above) while null is zero, nil; the cardinal number before einn.

As nouns the difference between atrium and arboretum

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

As nouns the difference between atrium and plaza

is that atrium is atrium (a square hall lit from above) while plaza is beach.

As nouns the difference between atrium and acclaim

is that atrium is atrium (a square hall lit from above) while acclaim is (poetic) an acclamation; a shout of applause.

As a verb acclaim is

(archaic|transitive) to shout; to call out.

As nouns the difference between arena and atrium

is that arena is sand while atrium is atrium (a square hall lit from above).

As a noun atrium

is atrium (a square hall lit from above).

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between atrium and quadrangle

is that atrium is atrium (a square hall lit from above) while quadrangle is (geometry) a geometric shape with four angles and four straight sides; a four-sided polygon.

As a proper noun terrace

is a city in british columbia, canada.

As a noun atrium is

atrium (a square hall lit from above).

As a noun atrium

is atrium (a square hall lit from above).

As an adjective undefined is

lacking a definition or value.