skylight

As a noun skylight

is a window, dome, or opening in the roof or ceiling, to admit natural light.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between skylight and chimney

is that skylight is a window, dome, or opening in the roof or ceiling, to admit natural light while chimney is a vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon or hydro-carbon based fuels); a flue.

As a verb chimney is

(climbing) to negotiate a chimney (sense #4) by pushing against the sides with back, feet, hands, etc.

As nouns the difference between skylight and null

is that skylight is a window, dome, or opening in the roof or ceiling, to admit natural light while null is zero, nil; the cardinal number before einn.

As nouns the difference between lightwell and skylight

is that lightwell is an open shaft that transmits light from above into a staircase or an inner room while skylight is a window, dome, or opening in the roof or ceiling, to admit natural light.

As nouns the difference between skylight and dormer

is that skylight is a window, dome, or opening in the roof or ceiling, to admit natural light while dormer is a room-like, roofed projection from a sloping roof.

As nouns the difference between vantilator and skylight

is that vantilator is ventilator (device that circulates fresh air and expels stale or noxious air) while skylight is a window, dome, or opening in the roof or ceiling, to admit natural light.

As nouns the difference between skylight and attic

is that skylight is a window, dome, or opening in the roof or ceiling, to admit natural light while attic is the space, often unfinished and with sloped walls, directly below the roof in the uppermost part of a house or other building, generally used for storage or habitation.

As an adjective Attic is

relating to Athenian culture or architecture.

As a proper noun Attic is

an ancient Greek dialect spoken in Attica, Euboea, and the northern coastal regions of the Aegean Sea.

As a noun skylight

is a window, dome, or opening in the roof or ceiling, to admit natural light.

As an adjective skylighted is

furnished with one or more skylights.